A block hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = $5.98 \times 10^{24}\; kg$) have to be compressed to be a black hole ?

Question

( A ) $10^{-6} m$
( B ) $10^{-2} m$
( C ) 100 m
( D ) $10^{-9} m$