Answer:
B.
Explanation:
Per worker production function expresses the relationship between the amount of capital per worker (horizontal axis) and the output per worker (vertical axis), other things constant (level of technology and the rules of the game).
Any point in the production function (PF), shows how much output per worker can be produced for a given amount of capital per worker.
When there are k units of capital per worker, average output per worker in the economy is y.
Upward slope of the curve occurs because an increase in capital per workers helps each worker produce more output.