Fusion & Fission are both processes that involve D. Strong Nuclear Fundamental forces
"D". is the answer
If we pull an object vertically upwards then we need to apply a force which is equal in the magnitude of the weight of the object

now when we pull the same object upwards along an inclined plane with angle then we require a force which will balance the component of weight along the inclined
so it is given as

so as if we compare the two forces we can say that since the value of sine is always less than 1 for an angle less than 90 degree
so in the 2nd case when we pull the object along the inclined plane it will require less effort
so correct answer is
<em>A. reduce effort</em>
Abraham Lincoln
Explanation:
hope it helps you a little
The answer should be D) Cold air because even though its true sound can travel through all types of matter, air which is a gas, can travel but it travels SLOWLY while sound travels quickly in SOLIDS.