Many of these gene flaws - there are plenty of them, with na

Hi, could an expert please help me with this explanation?

Many of these gene flaws - there are plenty of them, with names like BCR-ABL - are relative newcomers to medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.

A. medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.
B. medical terminology like a majority of the new anti-tumor drugs that are still in early testing, and aimed at them.
C. medical terminology, as are a majority of the new anti-tumor drugs that are still in early testing, aimed at them.
D. medical terminology like a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.
E. medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, and aimed at them.

Meaning - The sentence is doing a comparison between 2 entities (clauses) in terms of their " relative newness"
Clause 1 involves gene flaws and Clause 2 involves anti-tumor drugs

POE:

C & D are out because they use "like" to compare clauses
B - "aimed at them" - it is not clear what this modifies
E - "and aimed at them" is not parallel are relative newcomers .. does not make sense

A is the correct answer

Many of these gene flaws - there are plenty of them, with names like BCR-ABL - are relative newcomers to medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.


A. medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.

B. medical terminology like a majority of the new anti-tumor drugs that are still in early testing, and aimed at them.

C. medical terminology, as are a majority of the new anti-tumor drugs that are still in early testing, aimed at them.

D. medical terminology like a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.

E. medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, and aimed at them.

Many of these gene flaws - there are plenty of them, with names like BCR-ABL - are relative newcomers to medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.

A. medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.
B. medical terminology like a majority of the new anti-tumor drugs that are still in early testing, and aimed at them.
C. medical terminology, as are a majority of the new anti-tumor drugs that are still in early testing, aimed at them.
D. medical terminology like a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.
E. medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, and aimed at them.

Meaning - The sentence is doing a comparison between 2 entities (clauses) in terms of their " relative newness"
Clause 1 involves gene flaws and Clause 2 involves anti-tumor drugs

POE:

C & D are out because they use "like" to compare clauses
B - "aimed at them" - it is not clear what this modifies
E - "and aimed at them" is not parallel are relative newcomers .. does not make sense

A is the correct answer

Many of these gene flaws - there are plenty of them, with names like BCR-ABL - are relative newcomers to medical terminology, as are a majority of the new anti-tumor drugs, still in early testing, that are aimed at them.

"them" towards the end refers to the gene flaw?