Based on the Description Below

based on the description below:
A researcher is interested in testing how brain tumors influence in Wernicke's area (i.e., a region of the brain) . Past research indicates that damage to Wernicke's area often leads to an inability to produce and understand basic nouns and verbs. The researcher's study includes three phases. In phase 1, she recruits fifteen individuals who have brain tumors around Wernicke's area to serve as her sample of individuals with brain tumors and fifteen individuals without brain tumors to serve as controls. In phase 2, she will administer a task to examine how participants in both groups' brain activation might differ in a naming task of common objects that participants will be viewing during the study, and participants will also be asked to produce the nouns and verbs that are associated with the picture. In phase 3, the researcher examines how participants in both groups might differ in a comprehension task in which participants will be listening to audio stimuli and selecting images that correspond to a description. Participants will be paid for their participation.
-Which of the following might be a strong concern of the IRB and a corresponding request that they might make?

A) Researchers should not only recruit right-handed individuals for a study like this. They must include an equal sized sample of left-handed individuals.
B) The research team is using a procedure that is too invasive and dangerous. They should use a different apparatus.
C) The research team should compensate the group with tumors more than the group without since they are receiving the experimental manipulation.
D) The research team should provide a source of diagnosis and treatment (if necessary) for the group who is found to have brain tumors near Wernicke's area.