Hello There!
Physical activity definitely controls weight.
Also, it does promote better sleep.
Studies have also shown that it improves energy.
Based on these facts, i'm going with D.
Hope This Helps You!
Good Luck :)
Explanation:
Given that, you are taking a picture of a giraffe that is standing far away from you. The image is just too small, so you swap the 60-mm-focal-length lens in your camera for a 960 mm telephoto lens such that,


We need to find the the factor with which the size of the image increases. It can be calculated by taking ratios of both 
So, 

So, the size of image increases by a factor of 16. Hence, this is the required solution.
Colder in Alaska, warmer in Mexico.
The hotter molecules become, the faster they move around. The colder they are, the more slow and lethargic they are