Correct Option (3)
The passage explicitly states, "The layers of sedimentary rock become thicker and heavier. Their pressure produces heat, which transforms the tiny carcasses into crude oil." This indicates that the weight of the overlying sediment layers generates the necessary heat for the transformation of organic matter into crude oil.
Incorrect Options:
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Option (1): The passage does not mention saline conditions as a factor in the formation of oil deposits due to sedimentary rock. The explanation focuses on the physical processes of pressure and heat.
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Option (2): The passage states that sedimentary rock "effectively shut out the oxygen, so preventing the complete decomposition of the marine deposits underneath." This directly contradicts the idea of dissolved oxygen entering the dead organic matter.
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Option (4): The passage attributes the transformation to heat generated by pressure from sedimentary layers. It does not mention the presence of catalytic substances within the sedimentary rock that facilitate the chemical reactions for oil formation.