Asubject participates in a drug study because treatment is available at no or reduced cost, and he could not otherwise afford it. this is an example of:

a. economic vulnerability
b. communicative vulnerability
c. social vulnerability
d. institutional vulnerability

Letter A is the correct answer.

Economic vulnerability refers to the inability of people to get what they need due to their financial conditions. This situation is a good example of economic vulnerability because the subject only participates in the drug study because that's the only chance he/she will have to get the treatment he/she needs.

is this from a story?

if so, can you tell which one?

~courtney