Exhibit 14-2 Cigarette Smoking Data
Jack Enjoys Smoking, While Jill

Exhibit 14-2 Cigarette smoking data
Jack enjoys smoking, while Jill fears that second-hand smoke will shorten her life. The following table shows the value Jack places on each cigarette he smokes, and the value Jill places on her shortened life. Use the table to answer the following question(s) : $$\begin{array} { | c | c | c | c | } \hline \begin{array} { c } \text { Quantity } \\\text { of cigarettes }\end{array} & \begin{array} { c } \text { Total value to Jack } \\\text { of cigarettes }\end{array} & \text { Days of life lost } & \begin{array} { c } \text { Total value to Jill } \\\text { of days lost }\end{array} \\\hline 1 & \$ 50 & 1 & \$ 30 \\2 & 90 & 2 & 60 \\3 & 120 & 3 & 90 \\4 & 140 & 4 & 120 \\5 & 150 & 5 & 150 \\\hline\end{array}$$
-As shown in Exhibit 14-2, what is the socially efficient number of cigarettes?

A) 0.
B) 1.
C) 3.
D) 5.