PLEASE HELP! MAJOR TEST GRADE! :(

QUESTION:
What are the conditions used to determine the 'standard state' of an element?

A- 100 degrees C and one atmosphere air pressure

B- 0 degrees C and no air pressure

C- 25 degrees C and one atmosphere air pressure

D- 25 degrees F and 100 atmospheres of air pressure

E- 25 degrees C and no air pressure