In general, which factor is not critical when pregnant?
a. getting regular prenatal checkups
b. avoiding tobacco
c. avoiding drugs and alcohol
d. weighing yourself daily

Getting regular checkups is very important, as they can for example show that the baby will need instant medical attention or will have to be delivered through  an emergency cesarean.
Tobacco, drugs and alcohol are extremely dangerous to unborn children, and people whose mothers smoke or took drugs can suffer the consequences their entire life. 

However, 
d. weighing yourself daily 

is not very important - less regular check-ups are ok, especially since there is a lot of short-term fluctuation concerning weight. 

Perform surgeries is the correct answer.

Ibelieve the answers are a and c.