Question

summarizing risk associated with tattoos
as the popularity of tattoos continues to grow, so does the concern about potential risks. some risks, such as the spread of infections through the use of unsterilized needles, are known. but what is not clear is the safety of tattoo inks.
the us food and drug administration (fda) has received reports of bad reactions to tattoo inks right after tattooing or even years later. some people report itchy or inflamed skin around their tattoos in the summer when they have been out in the sun. recent reports associated with permanent makeup inks have prompted fda to study tattoo ink safety.
-- \think before you ink: are tattoos safe?\
us food and drug administration
what is the main idea presented in the passage?
tattoos can cause infections through dirty needles.
the safety of tattoo inks has not been studied enough.
getting a tattoo is a very high - risk activity that is not recommended.
the fda controls and licenses tattoo parlors.

Explanation:

The passage first mentions concerns about tattoo risks, then focuses on the unclear safety of tattoo inks. It gives examples like FDA - reported reactions and recent reports prompting FDA study. The other options are either too narrow (infection from dirty needles is just one known risk, not the main idea) or incorrect (the passage doesn't say tattoos are "not recommended" or that FDA controls and licenses tattoo parlors).

Answer:

The safety of tattoo inks has not been studied enough.