Table 10-1 the Following Table Shows the Private Value, Private Cost, and Cost

Multiple Choice

Table 10-1
The following table shows the private value, private cost, and external cost for various quantities of output in a market.
-Refer to Table 10-1. What is the socially-optimal quantity of output in this market?

A) 1 unit
B) 2 units
C) 3 units
D) 4 units