4. pollsters construct a sample in the second step of a scientific poll in order to a) make sure their questions are well written b) find a group to represent the universe c) question each member of the universe d) analyze and report their poll findings

Explanation:

Pollsters refer to people that apply surveys in order to obtain data of their interest and opinions. So, the action 'construct a sample' is aimed to find a smaller group that represents the whole universe of study, because they can't  study all the universe, at least it's a small subject that they're investigating.

answer by yourhope:

the speaker of which statement would be best served by joining an interest group?

i want politicians to make more of an effort for lgbt rights!

: )

is there even a question here? you seem to have the answer and there is no quote to look at.