3. Let the center of rhombus $A B C D$ be $O, E, F$ are two points inside the rhombus that are symmetric about $O$. Connect $C E, D F$, then the relationship between line segments $A B, C E, D F$ is ( ).
(A) The sum of the two shorter line segments is greater than the longest line segment
(B) The sum of the two shorter line segments is equal to the longest line segment
(C) The sum of the two shorter line segments is less than the longest line segment
(D) Cannot be determined
3. (A).

Take the symmetric point $G$ of $E$ with respect to $B D$, then $G$ is symmetric to $F$ with respect to $A C$, so $A G = C E, B G = D F$. In $\triangle G A B$, the sum of the two shorter sides must be greater than the longest side.