One of the goals of a persuasive speech is to _strengthen,weaken____ the attitudes, beliefs, or values of your audience
I put D and got it right. I hope I helped!

I washed your t-shirt because it was oily.
An author who wanted to increase the complexity of a character might make that character more ambiguous. A person who is ambiguous is a person with a bad behaviour and it makes them act differently throughout the story. For example, a boy who is moral but fusses because he doesn't get the toy he wants, this is considered as an ambiguous character. Therefore, the answer is ambiguous.