I will go with C.
Premise: Trait X is due to Heridity. Trait Y is due to environment.
Assumption: A given trait is ENTIRELY
due to EITHER
environment. (Mutually Exclusive)
(A) Fewer than half of the pairs of twins studied were raised separately. --> If the assumption above is accepted, the size of the group doesn't matter.
(B) The ages of all of the twins studied fell within a 10-year range. --> Out of scope (OOS) - Age doesn't matter-
(C) Some of the traits that the study attributed to heredity developed in the separately raised twins because those pairs all grew up in similar families. --> ATTACKS MY ASSUMPTION
. MY ARGUMET IS FALLING APART! HELP!
(D) Although over half the traits measured were determined to be linked to heredity, the nature of those traits varied widely. --> OOS - Nature of the traits is not an issue
(E) The 11 traits that were measured constitute a representative sample of larger, generally accepted pool of key personality traits ---> OOS - Type of trait is not an issue.
"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."
- Bernard Edmonds