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It seems to be Modifier and SV issue.
I could catch the Modifier issue. And if I go through it, A,B,D and E are out straight away.
But Is it correct to Past perfect and Present perfect in the same sentence?
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SudhanshuSingh It is certainly possible to mix past and present perfect in one sentence if the time relationships are complicated enough: "I worked hard in college to make up for all that I had failed to learn in high school, but now that I have been out of school for several years, I find that I have forgotten it all anyway." However, there is actually no past perfect in C. The word "had" in that context is simply the past tense of "have." Replace "had" with "achieved" and you'll get the idea.
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abhimahna, " Homo erectus is estimated to have " in B is correctly used?
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chesstitans
abhimahna, " Homo erectus is estimated to have " in B is correctly used?

No, it is not.

Homo erectus is estimated from a cache of bones... this construction does not make sense - Homo erectus is not estimated from the cache of bones.

It is estimated from a cache of bones ...this construction ( Option C) is alright - "it" (i.e. the placeholder pronoun representing the clause "Homo Erectus had control 700,000 years ago" - the time when they had control) can be estimated from the cache of bones.
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SudhanshuSingh It is certainly possible to mix past and present perfect in one sentence if the time relationships are complicated enough: "I worked hard in college to make up for all that I had failed to learn in high school, but now that I have been out of school for several years, I find that I have forgotten it all anyway." However, there is actually no past perfect in C. The word "had" in that context is simply the past tense of "have." Replace "had" with "achieved" and you'll get the idea.

DmitryFarber why in C, the sentence uses might have and then earlier. use of present perfect implies that it started in past and continues till present, but then earlier denotes that it occured before 70000 yrs .please explain
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abhimahna
A. Homo erectus had estimated control of fire 700,000 years ago, although other hominid groups might have even mastered fire earlier --> Estimated control means they were estimating to control but didn't actually control. Modifier placement issue. OUT.

B. Homo erectus is estimated to have controlled fire 700,000 years ago, and other hominid groups even had mastered fire earlier --> Using 'and' changes the meaning of the sentence.

C. it is estimated that Homo erectus had control of fire 700,000 years ago, although other hominid groups might have mastered fire even earlier

D. it is estimated for Homo erectus to have controlled fire 700,000 years ago, although other hominid groups might even have mastered fire earlier --> We were estimating for Homo Erectus?? lol. Are they our relatives or what? OUT.

E. 700,000 years ago, Homo erectus is estimated as having controlled fire, with other hominid groups even having mastery fire earlier --> Misplaced modifier issue and having controlled fire is wrong usage.

Though not the best approach, but the phrase "mastered fire even earlier" is correct. The placement of even is crucial here. Only C does that.

All other options are incorrect for other reasons too but thought to mention this one.
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