B 10 +(-34) Remove the brackets. 10 + - 34 But a plus multiplied by a minus = a minus. 10 - 34 = - 24 This is how B is written. It is the correct answer.
C 10 +(-34) comes down to 10? How. You've ignored the - 34. You can't just ignore things.
D 44? that means that when you remove the brackets in the original question, you get 10+-34 = 10 +34 = 44. But you cannot just make the - disappear
Answer B <<<<< It is the only one that handled the minus correctly