Answer:
C. 1.5×10^2 μg
I hope this is good enough:
A.) 1.5 * (10^2) kilograms = 150 kilograms
B.)1.5 * (10^7) grams = 15 000 000 grams
C.) 1.5 * (10^12) micrograms = 1 500 000 000 000 micrograms
Convert 1500000000000 Micrograms into Milligrams
1500000000
D.)2.3 * (10^9) milligrams =
2 300 000 000 milligrams