Bound or bounded?

Part of the problem is that the justices are not _5_ by an ethics code.

Choice:
5. [A]advanced [B]caught [C]bound [D]founded

By the meaning of this sentence, the choice should be C, the meaning I think is something like limit.

If this is not one multiple choice, could it be right to use caught? Because be caught by is one possible usage.

And as you see, the other three choices are all in past tense.
So could it be right to use bounded as one verb?

Here maybe bound is an adjective means limited or obliged?
However, bounded could also be an adjective means limited?

Anything wrong in my comprehension?

Answer

This is a similar problem to that in your previous question: bound here is the past participle of bind:

Bound …
2 forced to do something by law, duty or a particular situation
bound by something We are not bound by the decision
(Oxford Advanced Learners Dictionary)

So:

Part of the problem is that the justices are not compelled to act in accordance with an ethics code.

The construction BE VERB_{past participle} is not a past tense but a passive. However, in cases like this, it is impossible to distinguish between a past participle used in a passive construction and the same past participle used as an adjective: it amounts to the same thing.

Attribution
Source : Link , Question Author : HyperGroups , Answer Author : StoneyB on hiatus