Plz need help fast with these

Based on the cause-and-effect relationship in this sentence, what is the meaning of the word illuminate? the colors and patterns on the stained glass windows were illuminated as thousands of candles burned during the special church service. a) to melt or change form b) to grow taller or wider c) to become extremely hot d) to light up or make clear

Pls, i really need on this question?

Describe, in your own words why you think jean-jacques rousseau decided to write confessions. your answer should be at least one hundred words.