Question

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, or central, idea that ties all the details together.
it is helpful to study completed crossword puzzles.
several strategies can help you solve crossword puzzles.
some people enter crossword puzzle tournaments.

Explanation:

The details provided are about different ways (strategies) to solve crossword puzzles. The first option is about studying completed puzzles which is not related to the given details. The third option is about entering tournaments which is also not in line with the details. The second option "Several strategies can help you solve crossword puzzles" ties together the details of solving easier first, taking breaks, and moving to another part when stuck.

Answer:

Several strategies can help you solve crossword puzzles.