The answer is A, delta.
I know this because i had this on USATestPrep and got it correct :D
I think it’s A... not sure! Because you have no A so maybe A
The waves move toward land. When waves crash into the land over a long time, they can break rock down into smaller pieces. These pieces are called sand. A shoreline is a place where the land and the water meet.
Answer:

Cost : The expenditure incurred by a producer on the factor as well as non-factor inputs for a given amount of output of a commodity.
Answer:
True
Explanation:
Change blindness happens when an observer fails to notice large changes of objects or to scenes following a brief visual disruption. That is, visual stimuli undergoes a change without the observer noticing it.
For this case, the man had change blindness .He did not notice the first construction worker he was giving direction to was replaced by a different person. This was after a brief interruption caused by two experimenters passing between them carrying a door.