The aggregate production function shows a positive relation between the output produced and capital used per worker. What does the slope of the production function signify?

a. The slope of the production function shows by how many folds the country's economic growth has increased.

b.The slope of the production function shows how many workers are required to produce a given amount of output.

c.The slope of the production function shows how much extra output a worker produces when given an extra unit of capital.

d.The slope of the production function shows how much output a worker produces with the given amount of capital.

e.The slope of the production function shows how much output is produced in a financial year.