Assertion: The enthalpy of formation of gaseous oxygen molecules at `298K` and under1 atm is zero.
Reason: The entropy of formation of gaseous oxygen molecules under the same condition is zero.

Options

A. Both `A`and `R` are true and `R` is the correct explantion of `A`
B. Both `A`and `R` are true and `R` is not a correct explantion of `A`
C. `A` is true but `R` is false
D. `A` is false but `R` is true