💡 Detailed Explanation
'ないがしろにする (naigashiro ni suru)' means to neglect or make light of something important, like a duty, advice, or a person's feelings. Neglecting safety checks is a classic and correct usage. Choice 2 is contradictory; going to the gym is taking care of one's health, not neglecting it. Choice 3 is incorrect; for physical neglect of a room, '放置する (houchi suru)' (to leave as is) is used. Choice 4 is unnatural; 'あきらめて' (to give up) is the more appropriate verb for a dream.