GMAT CLUB OLYMPICS: In the researchers’ studies of HIV, it was found

A. In the researchers’ studies of HIV, it was found that the V1-V2 hypervariable region of the protein has many possible escape mutations, consistent with previous findings, and also found sequences that would have a lower probability of escape. ( Incorrect: "It" refers to the delayed subject in the sentence. A noun clause takes place of "it" when "it" refers to a delayed subject. Now, in this case, the First clause works fine but there is no "that" for the second clause. "found" is directly used as a verb. "It was found that X is amazing and found Y". The second found should have had "That" preceding it)

B. In the researchers’ studies of HIV, they found that the V1-V2 hypervariable region of the protein has many possible escape mutations, which is consistent with previous findings, and also found sequences that would have just as low of an escape probability. ( Incorrect: What does modifier "which is consistent" modifies, escape mutations? It should modify this new finding.)

C. The researchers’ studies of HIV found that the V1-V2 hypervariable region of the protein has many possible escape mutations, a result consistent with previous findings, and also found sequences that would have a lower probability of escape. ( Correct: Now "It" is removed so we don't have to worry about delayed subjects and related noun clauses. In this case, Study found X and also found Y. Correct sentence structure)

D. In the researchers’ studies of HIV, it was found that the V1-V2 hypervariable region of the protein have many possible escape mutations, which was consistent with previous findings, and also found sequences that would have just as low of an escape probability.( Incorrect: "It" refers to the delayed subject in the sentence. A noun clause takes place of "it" when "it" refers to a delayed subject. Now, in this case, the First clause works fine but there is no "that" for the second clause. "found" is directly used as a verb. "It was found that X is amazing and found Y". The second found should have had "That" preceding it. Also Subject-verb error is there)

E. In the researchers’ studies of HIV, it was found that the V1-V2 hypervariable region of the protein has many possible escape mutations, consistent with previous findings, and also found sequences that would have just as low of an escape probability. (Incorrect: "It" refers to the delayed subject in the sentence. A noun clause takes place of "it" when "it" refers to a delayed subject. Now, in this case, the First clause works fine but there is no "that" for the second clause. "found" is directly used as a verb. "It was found that X is amazing and found Y". The second found should have had "That" preceding it)