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Sentence Correction: Comparative Questions – Overview

The reason that tourists on safari are warned to keep a distance from elephants is because elephants are just as dangerous as predators are.

Incorrect.

This answer is stylistically flawed. Using both the reason and because is redundant.

What helps us identify this question as a Redundancy question as well as identify this mistake is the following Stop Sign:  

the reason + because

Very good work!

Using both the reason and because is redundant. This answer choice removes the words The reason while making correct use of the Comparative form with the phrase as dangerous as predators are.

Incorrect.

Although this answer choice corrects the original Redundancy mistake by getting rid of because which is redundant when we already have the reason, it is illogical and grammatically incorrect. As cannot be complemented by than because as indicates a similarity or equality between the two things compared whereas than indicates a difference between them. 

What helps us identify this question as a Comparative question as well as identify the mistake is the following Stop Sign:

Like, unlike, than, as

Incorrect.

Although this answer choice corrects the original Redundancy mistake by getting rid of because which is redundant when we already have the reason, it is stylistically flawed as it omits the verb are from the second half of the Comparative structure. 

Since there's another answer choice that corrects the original mistake but preserves the verb are, it is preferable to this one. Look for it!

Incorrect.

Although this answer choice corrects the original Redundancy mistake by getting rid of because which is redundant when we already have the reason, it changes the meaning of the original sentence by adding the word other in the phrase as other predators are. This addition implies that elephants are predators too. Apart from being incorrect, this statement does not appear in the original sentence.

The reason that tourists on safari are warned to keep a distance from elephants is because elephants are just as dangerous as predators are
The reason that tourists on safari are warned to keep a distance from elephants is that elephants are just as dangerous than predators are
Tourists on safari are warned to keep a distance from elephants because elephants are just as dangerous as predators are
The reason that tourists on safari are warned to keep a distance from elephants is that elephants are just as dangerous as predators
The reason that tourists on safari are warned to keep a distance from elephants is that elephants are just as dangerous as other predators are