The standard state convention commonly used in physical chemistry defines the standard state of a solute as that with __________.

A

Unit Enthalpy at $$25^{\circ}C$$ and 1 atm

B

Unit Entropy at $$25^{\circ}C$$ and 1 atm

C

Unit Activity at $$25^{\circ}C$$ and 1 atm

D

Unit Work function at $$25^{\circ}C$$ and 1 atm