Which of the statements clearly demonstrates that total factor productivity is increasing? Assume the aggregate production function is upward sloping and exhibits diminishing returns. Real GDP per worker grows at the same rate as human capital per worker.

Physical capital per capita, human capital per capita, and real GDP per capita remain constant.

The size of the labor force falls due to emigration which leads to a decrease in real GDP and human capital per worker. Real GDP per worker remains unchanged and physical capital per worker increases.

Physical capital per worker and human capital per worker decrease, but real GDP per worker remains unchanged.