Based on the Article, which best replaces the question mark in the diagram above?

There are two boxes. The box on the left is labeled "Cause," and it has a question mark in it. There is an arrow pointing to a box on the right. The box on the right is labeled "Effect," and it says "Dogs sniff around fire hydrants."
A) Dogs have an amazing ability to learn information beyond their sense of smell.
B) Dogs can sniff out bombs people would never find.
C) It's one of the ways dogs can mark time and evaluate how safe the surroundings are.
D) It's one of the ways dogs are considered social animals.