Generally she is cautious in her work.

Answer: Option C

Cautious : (of a person) careful to avoid potential problems or dangers.
Kind : a group of people or things having similar characteristics.
Fast : moving or capable of moving at high speed.
Rash : acting or done without careful consideration of the possible consequences; impetuous.
Hurtful : causing distress to someone's feelings.

Antonym of Cautious is Rash