Both petroleum and coal are made up of complex carbon-based molecules, and both originated with living creatures of some kind. both are vital sources of energy for the modern world and both were formed by geologic processes over millions of years. however, petroleum was mainly formed from the remains of ocean-dwelling microorganisms. coal, on the other hand, originated from decayed vegetation in ancient swamps and bogs. in any case, it took millions of years for both coal and oil to be produced. this is the case because it took that much time for overlying sediments to produce the unimaginable heat and pressure that would one day allow us to harvest these energy resources. this passage uses a combination of comparison and contrast and

a. chronological order. b. supporting details. c. cause and effect. d. examples and explanations.

Answers

I believe the answer is D not sure but sounds about right 
D. Supporting details
let me know if that helped 
Cause and effect are the correct answer
Base on the said passage, I would say that the passage uses a combination of contrast and comparison and also with examples and explanation. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications.
B. examples and explanations.
B. Cause and effect because it explained how the coal was formed from the life millions of years ago hense the cause part and it explains also how it helps us in everyday life now millions of years later effect.
Assuming that you're talking about the passage that explain the relationship about petroleum and Coal,
The passage uses a combination of comparison, and contrast and supporting details.

Hope this helps
Answer would be C
After reading the passage represented above I can clearly see what author uses besides combination of comparison and contrast. According to the main structure of such type of text, comparison and contrast method usually comes with C. Cause-and-effect to support pros and cons reasonably. So, the correct answer is the third option from the scale attached above.
The passage used a combination of comparison and contrast and:  C. cause and effect.
The passage give us a well descriptive explanation on how the microorganisms (the cause) developed in such a way to the point where their fossils ended up as a petroleum/coal (effect)     


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