Learning curves were first applied to industry by $\_\_\_\_\_\_\_\_$ who was studying $\_\_\_\_\_\_\_\_.$

Question $12$ options:

A$)$ Frank Gilbreth; worker efficiency

B$)$ Frank Lloyd Wright; architecture

C$)$ Lillian Gilbreth; factory efficiency

D$)$ Frederick W$.$ Taylor; scientific management

E$)$ T$.$ P$.$ Wright; air frame manufacture