$A$ and $B$ are the endpoints of a line segment. Segment $AB$ is crossed through point $C$ by another line segme

$A$ and $B$ are the endpoints of a line segment. Segment $AB$ is crossed through point $C$ by another line segment with endpoints $D$ and $E.$ If $\angle ACD > 90,$ and the sum of $\angle ACE$ and $\angle BCD$ is $x,$ then which of the following must be true?

A. $x < 90$
B. $x > 90$
C. $90 < x < 180$
D. $x < 180$
E. $x > 180$

Answer: D

Source: Princeton Review

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