A Carnot engine takes $3 \times 10^6$ cal of heat from a reservoir at $627^{\circ}C$ and gives it to a sink at $27^{\circ}C$. The work done by the engine is :

Question

( A ) $16.8 \times 10^6J$
( B ) $4.2 \times 10^6J$
( C ) zero
( D ) $8.4 \times 10^6J$