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Since dogs may be attracted to alcoholic beverages left out by the motel guests, it is strongly recommended to keep drinks and bottles out of their reach at all times.
This answer choice is stylistically flawed. The pronoun their is ambiguous because it agrees with more than one noun (dogs, motel guests).[[snippet]]
This answer choice repeats the original mistake. The pronoun their is ambiguous because it agrees with more than one noun (dogs, motel guests).
Moreover, this answer choice adds another ambiguity mistake as a result of replacing it with they. They is ambiguous because it agrees with more than one noun too (dogs, motel guests).[[snippet]]
While this answer choice corrects the original ambiguity mistake by replacing the ambiguous pronoun their with dogs', it is grammatically incorrect.
With the removal of the verb is, we now do not know what the pronoun it refers to. What does it replace in the sentence? In the original sentences, it is recommended makes sense as it is a pronoun tsubject replacement and therefore it needs no referent. But in the phrase it strongly recommended, it is the active subject of the sentence with no referent.[[snippet]]
This answer choice is grammatically incorrect. The singular pronoun its can only grammatically refer to motel, but this is not logical.
Since the phrase out of X's reach could only logically refer to dogs in the current context, the corrected sentence would require a plural pronoun.
This answer choice corrects the original ambiguity mistake, by replacing their with dogs'. Note that replacing strongly with highly does not constitute a change of meaning as strongly and highly are synonyms in this case.