Please i need some help

What is the best meaning for obscure in this line from the passage? a) ancient b) dark c) royal d) unknown

Which is a higher ratio, 6: 9 or 3: 7

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