'Remedial' relates to providing a remedy or cure for something, especially a problem or deficiency. It describes something intended to correct or improve a situation, such as remedial education for students falling behind. 'Curative' is the correct answer as it specifically relates to healing or curing, which aligns with the corrective nature of remedial measures. The other options (Bitter, Disturbed, Violent) don't capture the meaning of something that provides remedy or correction.