While driving in a new city, you briefly see a road sign that you think marked the exit you are looking for, but after a few seconds you can't remember what the sign said. This illustrates the quick decay of memory. iconic implicit echoic semantic

Iconic memory

Explanation:

Iconic memory refers to the short term visual memories people store when seeing something very briefly. They create pictures in the mind and they tend to fade away quickly. So the question here is a clear example because it involves seeing something briefly and conceiving the image to heart but after a short while, it just goes off your mind and you can't recollect it again.

is this supposed to be a question

i am pretty sure it is d.