If your BAL is at 0.4, you can expect a drop in complex performance compared to the sober level.

If your BAL is 0.4, you can expect a 54% drop in the complex performance compared to the sober level.

Explanation:

The BAL is an indication of the Blood Alcohol Level. A blood alcohol level of 0.4 indicates that there is 400 ml of alcohol in 1 litre of blood. This is very large as a BAL of 0.08 is considered as the maximum allowable BAL for driving.

answer(c); cultural values may have affected jack's grandmother's and aunt's belief about extended family;