Answer
A.
Work Step by Step
A. is found in the shape-shifting euglenids, which are not spherical or torpedo-shaped (B., C.). D. is wrong because the contractile vacuole is also found in other protists, the ciliates.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.