This question i based
following passage. The sentences are numbered to help you answer the question.
(1) Do you enjoy being ut in the fresh air? (2) Does nature restore your spirits? (3) You might want to consider hiking as : hobby. (4) It's : hobby you can begin with very little
expense. (5) All you need to start is a good pair hiking shoes.

The first sentence in the paragraph helps to ________
the main idea of the paragraph.

A. Introduce
B. Explain
C. Delay
D. Specify