Matt wants to conduct an experiment on people's perceptions of tattoos. He plans to manipulate the experimental conditions by making participants get tattoos of varying size and color on their arms. An ethics review board would most likely be concerned about the

An ethics review board would most likely be concerned about the physical risk to the participants.

Explanation:

The physical risks would be the ethics review board's main concern since Matt want to get participants to get a tattoo but this experiment and activity may have repercussions on the individuals that they might not even be aware of.

Since a tattoo is permanent and could in some cases lead to complications, it is not ethical to ask participants to get it. Their health may be at risk.

answer; (trauma);