Dromedary camels are better than horses because they
a) are much faster.
b) are easier to load.
c) have two more humps.
d) do not need any water.

The answer is B and they do not need as much water.

Its B or D 
But if the one-humped camel, the more accurate name for which is a dromedary, was saddled with a hump for bad behavior, what must the Bactrian camel, also just known as a camel, have done to earn two? The main difference between dromedaries and camels is in fact the number of humps