The correct option is C Rs. 14700
Suppose A,B, and C subscribe Rs. x,y and z respectively.
Then, y=z+5000 and
x=(z+5000)+4000=z+9000
Since x+y+z=50000
⇒z+9000+z+5000+z=50000
⇒z=12000
Now, x:y:z=21000:17000:12000
⇒x:y:z=21:17:12
∴ A′s share
=35000×2150=14700
Hence, A′s share is Rs. 14700.