Answer:
A. follow the 45-degree line from the origin
Step-by-step explanation:
In order to diversify the business that means the output level should be increased we need to rise the input i.e. no of planes and pilots
Now if we increase the no of planes by 1 so here the no of pilots should also be increased by 1 units
So the expansion path equation is y = x
Therefore the option a is correct