So 4in = 5ft
But we need 6ft 4in
1ft=12in, so 6ft=12in×6=72in and add the 4in to get 76in
We would need to find how many groups of 4in we need to get 76 in.
So, we divide 76 by 4 to get 19
So, since it takes 19 groups of 4in to get 72in, we would need to use 19 groups of 5ft to get his height on the screen.
So we multiply 19 by 5 to get:
*drumroll*
Which means B is your answer