Question

I only need help on #15! Thanks!

Answer 1

I would have to say that 'B' and 'D' are both correct.

Increasing the voltage that you're using to operate a circuit
causes the current in the circuit to increase.  But current is
just the number of electrons that are flowing through it.  So
right there, you have the increase in the number of charges.

Now, every electron that flows through the circuit gives up
some energy on the way.  So if there are more electrons
making the trip, then more energy has been put into the circuit.

Jessica, I absolutely love your printing.
I wish I could print so clearly.