Answer: 17 points
Explanation:
The Opportunity cost in this case is the amount of points that Jose has to forgo for picking one alternative.
If Joe had picked strategy B which would give Jose 90 points on statistics then that means that Jose would not have picked strategy A which gave a 94 in Economics.
Therefore instead of getting a 94, Jose would get a 77. The opportunity cost is therefore;
= 94 - 77
= 17 points