Why is it that some people can consume lactose and others are considered lactose intolerant?

Explanation:

Symptoms are usually mild, but can sometimes be severe. Consistently  experiencing symptoms after eating or drinking dairy products may be a sign that you are lactose intolerant. But if you experience occasional bouts of discomfort following dairy consumption, it doesn't necessarily mean that you're lactose intolerant.

the answer is c   it wants me to write more for no reason bu c is the answer                                                                                                                

no

explanation:

your too far away.