Engineers drill in the ocean floor for a. manganese nodules. c. drinkable water. b. sodium chloride. d. oil and natural gas.

Option D

Explanation:

Natural gas and oils are used as fuels for various purposes. They are extracted by a set of machinery from the ocean floor. The reason why the ocean floor is the best source of natural gas and oil is marine life.

Throughout the earth's history the marine algae and land plants with large deposits is accumulating deep inside the ocean forming natural gas and oil. It becomes a reservoir for oil and natural gas which is extracted out by the help of modern drilling techniques from depths.

the answer is b.) hydrogen bonds between bases.

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