Her impetuous behaviour was attributed to her upbringing.

poised
rash
quiet and gentle
sluggish

The correct answer is B. rash.

Impetuous means acting or done without careful thought or consideration. Rash means acting or done without proper caution or care. Both words describe someone who acts quickly and without thinking about the consequences.

Poise means self-assurance and control, especially in difficult or trying situations. Quiet and gentle mean not loud or violent. Sluggish means slow and lazy.

In the context of the question, it is clear that the woman’s upbringing led her to act without thinking about the consequences. This is consistent with the definition of rash, but not with the definitions of poised, quiet and gentle, or sluggish.