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