The correct choice is C : (a) and (d) only. Here's why: In a galvanic (voltaic) cell The anode is where oxidation occurs and is the negative terminal. The cathode is where reduction occurs and is the positive terminal. ⇒ (b) "Anode is positive" is false, (d) "Cathode is positive" is true. Conventional current (flow of positive charge) goes from cathode to anode through the external circuit. ⇒ (a) is true. A negative cell potential means the reaction is non-spontaneous: Ecell <0⟹ non-spontaneous ⇒ (c) is false.