Option A - INCORRECT.
It would certainly be true because from childhood they imitate who raised them. Since there exists more Sifakas that uses Right hands than there are who uses left. Their parentage must have been clearly responsible for such behaviors. It is supportive though but not as weighty as we'd have wanted it to be so.

Option B - INCORRECT.
Since more Sifakas use left hands more than the right it is thus an INCORRECT Assertion to think there could exist a deviation among them (they don't think like humans) their imitative capacities constrains them to behave like whoever they imitate.

Option C - INCORRECT.
This could not be true because of their imitative behavior, they either use right or left hands. Using both hands would mean their imitative behavior should be discarded since they ''generally share their parents' handedness''.

Option D -INCORRECT.
Not true too, it is possible their is though a left handed member of the family but that's not to say one of their parents have such behavior. Humans could be ambidextrous. Does that mean one the parents is too? INCORRECT assertion.

Option E - CORRECT.
YES, very true because they see those captors as their parents and take after them in the way they do things. They would remain right handed even if their original parents are otherwise became it is not hereditary but rather imitative. A sound and CORRECT point from the options.