\begin{tabular}{|l|l|l|} \hline Q & P & TC \\ \hline 0 & $160 & $3,000 \\ \hline 10 & $152 & $3,630 \\ \hline 20 & $144 & $3,990 \\ \hline 30 & $136 & $4,170 \\ \hline 40 & $128 & $4,260 \\ \hline 50 & $120 & $4,350 \\ \hline 60 & $112 & $4,530 \\ \hline 70 & $104 & $4,890 \\ \hline 80 & $96 & $5,520 \\ \hline 90 & $88 & $6,510 \\ \hline 100 & $80 & $7,950 \\ \hline \end{tabular} Describe the competitiveness of the market by calculating the Lerner index. Select one: a. 53.8% b. 74.0% c. 33.2% d. 46.7%