Question

Which of the following might the government invest in to promote infrastructure growth?
a. R & D
b. education
c. health care
d. physical capital

Answer 1

i think the answer is D physical capital

Answer 2

Hello there!
Its a great pleasure for me to be helping you today!
So "Physical capital" is the one the government might invest in to promote infrastructure growth. 
Hope i  helped today!
~Sammy)