Question

Which one will be the answer? And how do I know ?

Answer 1

Option A

Explanation:

To start, there are approx `6.2x10^19` electrons in a Coulomb.

A refers to a micro-Coulomb, `10^-6`
B refers to a nano-Coulomb, `10^-9`, so A is greater than B

For C, there are approx `6.2x10^19` electrons in a Coulomb, so `10^12` electrons results in approx `10^-7` Coulomb, so less than A

D is about the same as C.

A has the greatest charge