No chordates are tracheophytes, and all members of Pteropsida are trac

Hello email2vm

I'm glad to help.

ANALYZE THE STIMULUS:

Name:
C = chordates
T = tracheophytes
P = Pteropsida
H = Hominidae.

Argument says:
(1) C # T (No C = T)
(2) P = T (All P = T)
(3) Thus: P # H (No P = H)

If H = C --> P # H. Because If H = C --> H # T (according fact 1), but we also have P = T --> P # H (conclusion)

ANALYZE EACH ANSWER:

(a) All members of the family Hominidae are tracheophytes
Wrong. H = T --> P = H. Hence, wrong.

(b) All members of the family Hominidae are chordates
Correct. H = C --> H # T, but P = T --> H # P. Correct.

(c) All tracheophytes are members of Pteropsida
Wrong. T = P. This is fact #2. Clearly, it is an assumption.

(d) No members of the family Hominidae are chordates
Wrong. What if H # C, but H = T? --> P = H --> Clearly the conclusion P # H is wrong.

(e) No chordates are members of Pteropsida
Wrong. C # P. This is a combination of fact #1 and fact #2. The combination is still a FACT. It is not a hidden statement which is defined as an assumption by GMAT standards.

Hope it helps.