My first respond to this question is thinking about inertia and my answer goes to C.

Reedit : second thought, answer is B.

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My explanation:

1. An opposite force, f occurs at the string to resist F. The direction of f is to the left.

2. Resultant force of L is pointing south west.

3. Resultant force of B is pointing north west.

This post has been edited by work_tgr: Aug 15 2013, 11:38 PM