An ammeter and a voltmeter are joined in sereis to a cell. Their readings are `A` and `V` respectively. If a resistance is now joinding parallel with the voltmeter. Then
A. both `A` and `V` will increase
B. both `A` and `V` will decrease
C. `A` will decrease, `V` will increase
D. `A` will increase, `V` will decrease
