Essential information about research projects to potential study participants so that they can make a reasoned decision about whether to enroll in the study

a. surveys
b. interviews
c. informed consent statements
d. research protocols

Option C

Explanation:

Informed consent is a document or process that aims at providing research relevant information (all key elements) to the participants. It is a practice followed to cater the ethical issues involved in the research.  

A written consent document is provided to the participants and they are asked to provide their approval and consent on the same.  

Hence, option C is correct

answer; polycythemia is the correct answer;

mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

explanation: