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Hi there,

Don't you think that b and c are both correct answers in the below-mentioned sentence?

Many official institutions doing research _______ with ethical issues with regard to experiments on humans.

a) are worried b) are bothered c) are concerned d) are connected

thx
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No, you'd say "bothered by" but "concerned with."

(Worried about, bothered by, concerned with, connected to)
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So what's the difference between "connected with" and "connected to"? thx
You're right, "connected" can take either.

A is connected to B would tend to mean a physical connection.
A is connected with B would tend to mean an association of some sort.