I'm not 100% sure but I'm leaning towards D. :)
1. minimize
2. not buy the insurance
3. too expensive in relation to the value of his vehicle
The formula for mole is
n= Mass/Mol mass
Mol Mass: S=32
O2= 16(2)
—————
64 g/mol
N= 17.50 g
————— (cancel both g)
64 g/mol
= 0.27 mol is the answer
Vanadium (V)
Vanadium is the only one in the 4th period here so