Believe in yourself. Know your rights. Decide what you want, Get the facts. Planning strategy. Gather support. Target efforts. Express yourself clearly. Assert yourself clearly. Be firm and persistent. Here's a list of 10 examples.
Out of all of those, I would have to say the answer would be C.
They are called homonyms.
Hope this Helps!!
If you want to define the word instructive, then you can say. Instructive can be defined as useful. This is because in paragraph 1 it says, "self portraits can at once expose and obscure, clarify, and distort"