The speed of light when light goes through glass. a) decreases marginally b) decreases substantially c) increases marginally d) increases substantially e) none of these the answer isnt in my book and i cant find it on the internet. i think its b but its a guess

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.