Look at these details from a paragraph about the same topic:

- You should solve easier crossword puzzles before trying harder ones.
- When you get stuck on a clue, take a short break and try again later.
- If you are really stuck, move to another part of the crossword puzzle.

Choose the main idea that ties all the details together.

A. Several strategies can help you solve crossword puzzles.
B. Taking breaks from a crossword puzzle can help you solve it.
C. Some people enter crossword puzzle tournaments.
D. It is helpful to study completed crossword puzzles.