What are liquid crude oil and petroleum made from?
a. small marine organisms
b. small land-based organisms
c. compressed rock and sediment
d. decomposing inorganic matter

Small marine organisms. 

Liquid crude oil and petroleum are made from small marine organisms.

Noble gases is far right

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.