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Let AB be a line segment with midpoint C...

Let AB be a line segment with midpoint C, and D be the midpoint of AC. Let `C_1` be the circle with diameter AB and `C_2` be the circle with diameter AC. Let E be a point on `C_1` such that EC is perpendicular to AB. Let f be a point on `C_2`such that DF is perpendicular to AB. Then, the value of `sinangleFEC` is

A

`1/sqrt10`

B

`2/sqrt10`

C

`1/sqrt13`

D

`2/sqrt13`

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