Is there supposed to be a sentence? I'm just guessing D
I think is going to be A historian for the web site of Sioux tribe of Montana. I hope this is correct.
Answer: It's C
The sentence that has a dangling modifier error is the following one: After seeing a movie about overflowing landfills, a new program for recycling was started in our town. The modifier used at the beginning of this sentence should be modifying the speaker of the sentence as the ones who watched the movie about overflowing landfills.