Read the following context and choose the best option to answer the question.
Context: So , my sister just had baby number two . She went in for a checkup today and they decided to induce labor due to one complication or another . A few hours after being induced labor began and ended quite quickly . So quickly in fact that my mother who had went to take their other son to her house for some rest did n't have time to get back to the hospital .
Question: What may be the reason why it was n't long before baby number two entered the world ?
Options: 
A. They took supplements that helped the baby come out faster .
B. They knew how to breathe to make it go quicker .
C. After baby number one , it usually takes less time for the babies to be born .
D. They had to have a c - section .


C