The pentagon, or u. s. military, has invested millions of dollars to develop that perform like real ones.
a.
artificial hearts
b.
bionic eyes
c.
prosthetic limbs
d.
model aircraft

The Answer is C. Prosthetic Limbs. In this age of combat within urban settings, more improvised explosives are used against deployed US Soldiers. This results in many U.S. Soldiers becoming injured and missing limbs. As part of their commitment to the quality of life for soldiers, the U.S. Military spends millions in developing prosthetic limbs in order to restore the quality of life of injured soldiers.