Which of the following activities constitutes engagement in research?
a. informing prospective subjects about the availability of research.
b. providing potential subjects with written information about a study.
c. obtaining subjects' permission for researchers to contact them.
d. obtaining informed consent and conducting research interviews.

D. Obtaining informed consent and conducting research interviews.

Explanation:

While doing a research study, there are some rules to be followed. When a researched study is done on  a particular subject on humans, we should obtained a consent from the potential subject human and then approach him or her with the interview questions related to the research topic.

Also the information of the research human subject should be kept confidential and should not be disclosed.

Thus the answer is D. Obtaining informed consent and conducting research interviews.

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.