Answer:
1 ⇒ C
2 ⇒ B
Explanation:
I cannot read the paragraph but understand grueling is in reference to something that is hard but you did/are doing (not impossible or easy). Also unfounded is not correct or unsure but it is more like a claim that has not been supported.
1. C
2. B
3. "155 miles through the desert sounded like a challenge he could overcome."
"it was organized by officials that kept the runners' safety in mind. Prosperi felt certain that his family..."
4. A
