existence of rocks didn't happen before any other event so we need past tense only.
A and D are incorrect for using the past perfect tense. Also A has redundancy with words now and currently.
In E, that needs to refer areas but incorrectly seems to refer to word now.
Active voice is preferred to passive form of construction, thereby eliminating C and hence B is the correct choice.
A and D are incorrect for using the past perfect tense. Also A has redundancy with words now and currently.
In E, that needs to refer areas but incorrectly seems to refer to word now.
Active voice is preferred to passive form of construction, thereby eliminating C and hence B is the correct choice.
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