Seems right, but if it’s just asking for one i would pick B
An earthquake's magnitude is a measure of how much energy an earthquake releases. Typically, the richter scale is used.
Sodium (Na) has a +1 charge and Iodine ( I ) has a -1 charge. To create a molecule of sodium iodide the charges will need to balance.
Because the charges on anion and cation are the same; the molecular formula will be NaI
