Answer:
The correct answer is: lower; higher.
Step-by-step explanation:
Opportunity cost is the cost of sacrificing the second-best alternative.
James can catch 5 pounds of trout or pick 10 pounds of oranges.
Sam can catch 3 pounds of trout or pick 12 pounds of oranges.
The opportunity cost of catching trouts for James is
=

=

= 2
The opportunity cost of catching trouts for Sam is
=

=

= 4
So we see that James has a lower opportunity cost of catching trouts.
The opportunity cost of picking oranges for James is
=

=

= 0.5
The opportunity cost of picking oranges for Sam is
=

=

= 0.25
So we see that James has a higher opportunity cost for picking oranges.