
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A quadrilateral ABCD, where $\angle A$, $\angle B$, and $\angle C$ are right angles, includes point E on line segment BD such that $\angle AEB = 50^\circ$ and $\angle BED = \angle BDE$. Determine $\angle CDE$.
A) 75°  
B) 80°  
C) 85°  
D) 90°  
E) 95°

Present the answer in LaTex format: \boxed{Your answer}
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