We have the following:
s is single
d is double
t is triple
h is homerun
hits is the total
h = s + d + t+ h
s = h - d - t - h
[tex]\begin{gathered} \text{SLG}=\frac{1\cdot s+2\cdot d+3\cdot t+4\cdot h}{AB} \\ s=120-15-8-12=85 \\ \text{SLG}=\frac{1\cdot85+2\cdot15+3\cdot8+4\cdot12}{375}=0.499 \end{gathered}[/tex]The answer is the option A