Choose the correct statements.1. Opportunity cost of a good is the increase in the quantity produced of one good divided by the decrease in the quantity produced of another good as we move along the PP
F:2. The opportunity cost of an action is the highest-valued alternative forgone.3. Opportunity cost is a ratio.4. There is no relationship between the opportunity cost of producing an additional good measured on the x-axis and the opportunity cost of producing an additional good measured on the y-axis.
选项：

A:Statements 1 and 3 are correct.;
B:Statements 1 and 2 are correct.;
C:Statements 2 and 3 are correct.;
D:Statements 2 and 4 are correct.;
E:Statements 3 and 4 are correct.