human research: how to

i'm taking an online course about research on human subjects. after each module they administer a quiz. after the 'international research' section they were really grasping at straws.. here's one of the questions.

Question 4 Multiple Choice/Single Answer - select only one answer (1 point)

Which of the following is the LEAST important activity when protecting human subjects in international research?

(a) Assessing local transportation conditions
(b) Considering local customs, norms, and laws.
(c) Consulting with members of the community from which subjects will be recruited.
(d) Determining if the research might present unique risks to subjects given local socio-economic conditions.

oy.