The correct answer is option 3: implies.

To understand why, we need to look at the word "right" and its meaning in this context. In this case, "right" refers to someone`s entitlement or legal claim to something. The word "duties" refers to responsibilities or obligations.

So when we combine "right" and "duties" together, it implies that there are certain responsibilities or obligations that come with someone`s entitlement or legal claims.

Option 1, obstructs, does not make sense in this context. Option 2, instructs, suggests that there is someone who is giving directions or guidance, but that is not the correct interpretation in this case. Option 4, opposes, does not fit with the concept of "right" and "duties" being combined.

Therefore, the correct option is 3: implies, as it accurately conveys the meaning of the phrase "right duties."