Geraldo went to the supermarket to buy a bottle of chocolate syrup. While there, he saw the latest copy of National Enquirer at the checkout stand. He had not planned on buying the magazine, but on the spur of the moment, he bought himself a copy. This decision by Geraldo is an example of:

A. impulse buying.
B. a habitual solution.
C. expected behavior.
D. extended problem solving.
E. convenience buying.