Final answer:
The Begonia x tuberhybrida refers to the Tuberous Begonia, which is known for its showy flowers and tuberous stems where it stores nutrients.
Step-by-step explanation:
The student's question is about Begonia x tuberhybrida, which is a type of tuberous begonia. The correct answer to the type of begonia described by the botanical name 'Begonia x tuberhybrida cv.' as given in the options is B) Tuberous Begonia. Tuberous begonias are well-known for their beautiful, showy flowers and the storage of nutrients in their thickened stems known as tubers.
Gardeners cultivate many different types of begonias, including wax begonias, dragon wing begonias, and rex begonias, each with distinctive characteristics and preferred growing conditions. Tuberous begonias, in particular, are appreciated for their lush, full-bodied flowers and the ability to thrive in a variety of climates, although they perform best in cooler environments with proper shading and well-drained soil.