Which best describes a scientific poll? Select one:
O a. The sample usually comes from the phone book.
O b. It is the same as a straw poll.
O c. It asks questions of everyone in the universe.
O d. Its sample accurately reflects the universe.

D

Explanation:

A Scientific poll is that scientific polls typically randomly select their samples and sometimes use statistical weights to make them representative of the target population.

And d is the nearest description.

the deaths of over a million communist soldiers

post-traumatic stress disorder in veterans