I'm not sure but I believe the answer is C.
Falling action is what happens near the end of a story after the climax and resolution of the major conflict. Simply put, falling action is what the characters are doing after the story's most dramatic part has happened.
Answer:
1) Marie Curie founded the Radium Institute in Paris, France to study the possible uses of radium.
2) During World War I, she accompanied and equipped a mobile X-ray unit.
Explanation:
In the first sentence, corrections that were needed were the capitalization of proper nouns. Also, the "too" was the wrong choice. "Too" means "as well." You need the infinitive form of the verb "to study."
In the second sentence, the corrections that were needed again had to do with the proper capitalization of proper nouns. Spelling was also an issue with words like accompanied.