
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 $ABCD$ is such that $\angle A = 50^\circ$, $\angle B = 90^\circ$, and $\angle D = 70^\circ$. If point $E$ is on segment $CD$ such that $\angle DEC = 20^\circ$, find $\angle BEC$.
A) $100^\circ$
B) $110^\circ$
C) $120^\circ$
D) $130^\circ$
E) $140^\circ$

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