Is Increased Capital Spending the Only Way for an Economy

Is increased capital spending the only way for an economy to expand its production possibilities curve?

A) Yes, more capital investment is the only way to expand production possibilities.
B) Yes, although increased production of capital clearly increases the opportunity cost.
C) No, an economy can also grow by reallocating more resources toward the production of consumption goods.
D) No, an economy can also expand by invention and innovation.