A group of elderly men, whose government disability benefits are the sole source of income, is approached to consider an experimental research study for their current colon cancer. The study involves more than minimal risk, but offers substantial financial incentives that are equal to two months of disability benefits. The IRB will be most concerned about the possibility of:

Undue influence on the subjects

Explanation:

An institutional Review Board (IRB) can be said to be a type of committee that uses research ethics by reviewing the   procedures (methods) to be used (proposed) for research a studies  to ensure that they are ethical.

According to federal regulations of expedited review of a new, proposed study can only  be used by the IRB if only the study involves no more than minimal risk and meets one of the allowable categories of expedited review specified in federal regulations. Usually, being involved in the research  studies is voluntary, but if you choose to take part, you waive the right to legal redress for any research-related injuries. IRB will be most concerned about the possibility of Undue influence on the subjects is critical to the research studies.

d. to get countries or companies to stop doing something objectionable.