First answer gets brainliest :
which of these is an example of surface runoff?

a. thunderstorms pour rain for several hours.
b. water flows along the side of a street into a storm drain.
c. groundwater is replenished by water trickling through rocks underground.
d. a mountain lake formed from melted snow dries up as summer approaches.

Surface runoff is water, from rain, snowmelt, or other sources, that flows over the land surface, and is a major component of the water cycle. Runoff that occurs onsurfaces before reaching a channel is also called overland flow. A land area which produces runoff draining to a common point is called a watershed. So, based on this definition can you make out the correct answer?