How is the marginal propensity to consume (MPC) defined?

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Total expenditure divided by total consumptionOverall consumption divided by total earningsVariation in consumption over variation in incomeChange in consumption relative to change in savings

Explanation

Option A states that the marginal propensity to consume is the ratio of total expenditure to total consumption. However, the correct definition of MPC is the change in consumption divided by the change in income, which is given in option C. The other options do not correctly describe MPC.