By connecting two identical storage batteries together in series ("+" to "-" to "+" to "-"), and placing them in a circuit, the combination will yield:
a. zero volts.
b. twice the voltage and the same current will flow through each.
c. the same voltage and different current will flow through each.
d. twice the voltage and different currents will flwo through each.

b) Twice the voltage and the same current

Explanation:

The two batteries are identical, and are connected in series. When elements in a circuit are connected in series, the same current flow through them but the voltage drops are additive.

Since the two batteries are identical, the possess the same voltage of magnitude V.

Therefore, the total voltage,

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete