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Sentence Correction: Tenses - Present Perfect

Since 2005, the iPod line of digital music players controlled the MP3 device market.

Incorrect.

Although this answer choice corrects the original Tenses error by using the Present Perfect with the time expression since, it is not the most concise of the answer choices. Since there is another grammatically correct, but less wordy, answer choice out there, it is preferable to this one.

Incorrect.

This answer choice is grammatically incorrect because it uses the Past Simple (controlled) with the time expression Since. Since is indicative of the Present Perfect tense; the action described began in 2005 and continues to the present.

Incorrect.

This answer choice is grammatically incorrect because it uses the Present Simple (controls) with the time expression Since. Since is indicative of the Present Perfect tense; the action described began in 2005 and continues to the present.

Incorrect.

This answer choice is grammatically incorrect because it uses the Present Progressive (is controlling) with the time expression since. Since is indicative of the Present Perfect tense; the action described began in 2005 and continues to the present.

Well done!

This answer choice correctly uses the Present Perfect tense (has controlled) with the time expression Since.

Since 2005, the iPod line of digital music players controlled the MP3 device market
Since 2005, the iPod line of digital music players controls the MP3 device market
Since 2005, the iPod line of digital music players has controlled the MP3 device market
The iPod line of digital music players is controlling the MP3 device market since 2005
The iPod line of digital music players has been in control of the MP3 device market since 2005