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imlittlestar

Answer

Option B) 7 is the correct answer  

FD = 7cm

Explanation

Here triangle AEC. D is the midpoint of EC and F is the midpoint of EA

So D and F be the midpoint of triangle AEC.  

FD be the midpoint  joining line.

We know that if any triangle, line joining the midpoint  of two sides is the half of the third side.

Here the third side is 14cm, then FD = 14/2 = 7cm

So option B) is the correct answer.