I think the error is "is going to," to be replaced with will.
"The Committee will give their vote on Tuesday."
A random sample is a subset of individuals that are randomly selected from a population of interest. Because researchers usually cannot obtain data from every single person in a group due to time, costs and other constraints, a smaller portion is randomly chosen to represent the entire group as a whole. The goal is to get a sample that is representative of the larger population.
What country are you taking about
I think the correct answer is D.