Answer is (2).

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1) Pa is unit of pressure.

Force/Area = Pressure

Unit of Pa should be Nm^-2

2) Coloumb is unit of charge, denoted by Q.

Q = current x time

Unit of Colomb is A s, which is correct.

3) Watt is unit of Power, donated by P.

E = Pt

Energy = Power x time

Power = Energy/time

Unit of P should be Js^-1

4) Volt is unit of voltage.

Volt (V)= Energy/Charge

Unit of V should be JC^-1