c) It doesn’t matter
Explanation:What are the  possibilities
1.If it ice cream is below room temperature it will cool the coffee.
2.If it ice cream is above room temperature(hypothetical) it will heat the coffee.
since the ice cream is in room temperature no heat transfer takes place so it doesn’t matter when you put it.

4)196
Explanation: There is  all squares of numbers between 6 to 13 so the next on the sequence is 14^2=196

The question has no answer.All the given are odd numbers.By adding three odd numbers you will never get an even number.Since 30 is an even number.