Question

Which best describes how the pharaohs’ used art and architecture? for decoration for functional purposes for celebrations for militaristic purposes

Answer 1

I think the answer is: for celebrations 

Many of Egyptian's ancient building was created  for religious celebrations or simply for artworks.
The spynx for example, was created as a part of tombs and temples that were used for important celebrations. The Pharaoh also use Tomb art as a celebration of death to wish the deceased good luck in the after world.

Answer 2

C) For celebrations

is the right answer, glad to help.