Legal and safe are different questions. First list your legal moves. For each, imagine the new board and check the opponent's captures. A move that avoids an immediate capture is safer for that reply, but it does not promise a win later.
Worked example
In a different position, red is on 8 and white on 16 and 31. Red can step to 11 or 12. Moving to 11 lets white jump 16 over 11 to 7. Moving to 12 leaves no board square beyond it for that white jump. In this one-reply comparison, 12 is safer.
Compare Two Plans
For your problem, red is on 9 and white is on 17 and 32. All pieces are men and all other squares are empty. Red moves toward the top. Red can step to 13 or 14. After each imagined red step, white moves toward the bottom. Check for an empty square beyond red from white's direction.