Product evaluation: stepable lawn aerator

Put on your thinking caps, people, it's quiz time.

Study the picture below, then select the answer that best explains the little turd-like objects in the grass:

a) Kate has acquired a dozen constipated Corgies which all became unconstipated at precisely the same time and in precisely the same place.
b) The dispute with the neighbor has become serious.
c) She’s been aerating the lawn.