A vehicle driving in a lane signalled in this way...
A)They can pay with the electronic toll system or by card, but not in cash.
B)They can only make the toll payment via the electronic toll system.Correct
C)They can make the payment in cash, with the electronic toll, or by card.
The sign in the question indicates that vehicles travelling in a lane signalled in this way will be obliged to make payment, at the toll, exclusively with the electronic toll system.
Not to be confused with the same sign but square, which indicates that you can pay using the electronic toll but that it is not mandatory to use it; that is, you can also pay using other systems.