Consider the Significant Costs to the Innovators and Developers of 3D

Consider the significant costs to the innovators and developers of 3D printing technology.Modern growth theory suggests that

A) there will be decreasing marginal returns to this investment.
B) there will be constant returns to this investment.
C) there will be increasing marginal returns to this investment.
D) follower firms will face higher costs than the pioneer firms.
E) the knowledge acquired in this innovation process will remain private.