All I can answer for you is 3, but the answer is A.
The answer to your question if you need more info ask
25% of 400 is 100.
It means that there are 100 red jelly beans and 300 belly jeans of a different colour in the bag.
Your chance of picking a jelly bean out of the bag which isn't red is 300/400. 300/400 is equal to 75% therefore the chance of not selecting a red jelly bean out of the bag is 0.75.