Question

The use of alcohol, tobacco, and drugs can contribute to all of the following except:
a. increased possibility of miscarriage
b. premature delivery
c. low birth weight
d. delayed labor

Answer 1

The use of alcohol, tobacco and drugs can contribute to all of the following like, increased possibility of miscarriage, premature delivery, low birth weight except delayed labor. It is impossible that a mother can have delayed labor because first using this kind of drugs can give you miscarriage.

Answer 2

The use of alcohol, tobacco, and drugs doesn't contribute to delayed labor - d. 

It usually leads to the other things which are increased possibility of miscarriage, premature delivery, or low birth weight. It does however happen that delayed labor isn't among the things.