Diminishing Returns to Physical Capital Mean That as More and More

Diminishing returns to physical capital mean that as more and more physical capital is combined with a fixed amount of human capital and a fixed technology, eventually:

A) GDP per worker declines
B) GDP per worker declines.
C) GDP per worker grows
D) GDP per worker grows.
E) additions to GDP per worker decline.
F) additions to GDP per worker decline
G) additions to GDP per worker increase
H) additions to GDP per worker increase.