Step 1: Understanding the Question:
This question tests knowledge of forest carbon sequestration.
Step 2: Detailed Explanation:
According to FAO (2015), the carbon sequestration potential of global forests is 84 tons per hectare.
This represents the amount of carbon stored in forest biomass.
104 (A): Too high.
74 (B): Too low.
64 (D): Too low.
Thus, the correct answer is 84.
Step 3: Final Answer:
Thus, the carbon sequestration potential is 84 tons per ha, which corresponds to option (C).
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