Crude oil is delivered from which of the following materials?

A. Marine organisms
B. Plants
C.Rocks
D.Salts

I think a

What about B, too? According to what I've read, both plants and animals decayed into crude oil.

http://www.bbc.co.uk/bitesize/standard/chemistry/materialsfromoil/how_crude_oil_was_formed/revision/1/

Oh okay, I thought it was A because we derive algae and plankton which are marine organisms? I read the article and B does make more sense, thanks, Ms. Sue.

You're welcome, Anonymous.

To determine which of the mentioned materials deliver crude oil, we can use our knowledge of the origin of crude oil. Crude oil is a natural resource formed over millions of years under specific conditions. It primarily comes from the remains of ancient marine organisms, specifically microorganisms called plankton, which lived in the oceans millions of years ago.

Therefore, the correct answer is A. Marine organisms.