I'm not for sure on this, but I would definitely pick C if it were me answering it.
Four museums around the country conducted a study to determine their effects on teens. Three-quarters of respondents said the arts programs had a more positive impact on their lives. Two-thirds said the experience had an effect on their later ideas and actions.
Answer:
the answer is a dependent clause
Answer: to honor Miep Gies and share her history with the audience
Explanation: took test got C wrong -