In In this experiment it takes about 10 µL of a solution to produce a spot 1 cm in diameter if the AgNO3 solution contains 10.8 g Ag+ per liter, how many micrograms of a Ag+ ions are there in one spot?

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.