I'm not 100% certain because i know that doctors give folic acid to both a and b. However, I'm going to say C because the folic acid is putting a liner on your stomach so that when you do get pregnant there will be protection from certain medications. I hope this is the right answer for you.
Answer: Something you don't want to eat
Explanation: my bad jit
A C AND D MY HONEST OPIONS I WOULD HAVE TO DO THEM
According to these criteria, the service sector covered in this paper is the economic activities other than agriculture, hunting, forestry and fishing, mining and quarrying, manufacturing, utilities (electricity, gas and water supply) and construction