Answer:
The correct answer is letter "B": It is a double-barreled question.
Step-by-step explanation:
Double-barreled questions usually have 2 questions joined into one. However, the answer to the complete question may not necessarily comply with the answer for each individual question. In the case, it is stated:
"I frequently solve and enjoy solving crossword puzzles."
The fact that "I frequently solve puzzles" doesn't necessarily mean that "I enjoy solving crossword puzzles", since one can solve puzzles just to make time, boredom or any other reason. To sum up, in the case of a double-barreled question the answer only responds to most part of it.