What does a sign with a picture of a gas pump indicate?

Answer: A — Gas station ahead.

A sign with a picture of a gas pump generally indicates that a gas station is located ahead on the road. This could be used to warn drivers to prepare to make a stop for gas, or to inform them of the location of the closest gas station. The other options are incorrect because a speed limit reduction is often indicated by a speed limit sign, a no parking or stopping sign does not necessarily have a specific picture associated with it, and a construction zone would typically be indicated by a sign with a picture of a road work or construction image.