If $W_1, W_2$ and $W_3$ represent the work done in moving a particle from $A$ to $B$ along three different paths $1, 2$ and $3$ respectively (as shown) in the gravitational field of a point mass $m$,find the correct relation between $W_1, W_2$ and $W_3$.
- A$W_1 > W_2 > W_3$
- B$W_1 = W_2 = W_3$
- C$W_1 < W_2 < W_3$
- D$W_2 > W_1 > W_3$
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