Final answer:
Iceberg Lettuce, also known as crisphead lettuce, is the variety that grows in firm, tight heads similar to cabbage and is the answer to the student's question.
Step-by-step explanation:
The term crisphead lettuce refers to the variety of lettuce that grows in tight, dense heads similar to cabbage. The correct answer to the question is A) Iceberg Lettuce. Unlike Romaine Lettuce, Butterhead Lettuce, and Leaf Lettuce, Iceberg Lettuce is known for its crisp texture and firm head. Brassica oleracea is a separate plant species in the mustard family that has been cultivated into various vegetables like cauliflower, broccoli, Brussels sprouts, and cabbage through selective breeding, indicating the vast diversity within the Brassica group, each with different edible parts