Both the first one and the last one could be correct here, but choosing which one is best would probably be the last one becasue the biggest difference, or what sets the two apart is primarily who is around.
Adjectives describe nouns.
The yellow sun hung brightly in the sky.
Noun: sun
Adjective: yellow
Yellow describes the sun.
Answer is c (the many awards were handed out by the school nurse and the principal)
The right answer is letter A. The fact that she didn't volunteer in the Build Homes for the Homeless program is irrelevant with her feelings about poor people.