atulmangal wrote:My pick is Op E, what's the source of this question??? i still think Op A is incorrect...IMO talking about meteorite explosion is more logical in this context than just meteorite...

niksworth wrote:E has multiple issues

1. Last year, in view of Harmony 2, NASA's largest telescope, the powerful explosion of a meteorite has provided evidence contradicting longstanding theories about how gamma ray blasts emit radiation and may thus force a reevaluation of the scientific communities' understanding of this phenomena.

Or, Modifier, modifier, modifier, main clause

Any sentence with a series of modifiers constructed like this is always a suspect. You never know which is modifying what.

2. Last year, in view of Harmony 2, NASA's largest telescope, the powerful explosion of a meteorite has provided evidence contradicting longstanding theories about how gamma ray blasts emit radiation and may thus force a reevaluation of the scientific communities'' understanding of this phenomena.

The tense issue is evident. Present perfect has provided does not resonate with last year.

3. Last year, in view of Harmony 2, NASA's largest telescope, the powerful explosion of a meteorite has provided evidence contradicting longstanding theories about how gamma ray blasts emit radiation and may thus force a reevaluation of the scientific communities'' understanding of this phenomena.

Notice how the articles are different from A, creating a subtle but important meaning shift.

Option A on the other hand is quite okay except for the weird placement of last year, which should ideally have been at the beginning of the sentence. It must be said though that the introduction of the noun explosion in 3 of the choices is extremely strange. Generally nouns are not introduced in answer choices. Also A will definitely make more sense if explosion is added to it. I guess the question creator was in some sort of a hurry!