Which of the following has the weakest linkage between activity and cost driver? 
Definitions:
Life Expectancy
The average period that a person is expected to live, which can vary significantly across different countries and communities.
Inflation
The rate at which the general level of prices for goods and services is rising, and, subsequently, purchasing power is falling.
Cigarette Habit
The cigarette habit refers to the regular consumption of cigarettes, often resulting in physical dependence on nicotine.
Net Present Value
A method used in capital budgeting to appraise the profitability of an investment, considering the time value of money.
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