Assertion(A): When

is subjected to dehydrohalogenation using NaOEt/EtOH, the product contains no deuterium .
Reason(R): `E_(2)` follows anti elimination.
A. If both A and R are true and R is the correct explanation of A.
B. If both A and R are true and R is not the correct explanatio of A.
C. If A is true but R is false
D. If A is false and R is true.