
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
$\triangle ABC$ is isosceles with $AC = AB$. Points $P$ and $Q$ lie on $AB$ and $BC$ respectively such that $AP = QB = \frac{1}{3}AC$. Determine the number of degrees in $\angle ABC$.
**A)** $60^\circ$
**B)** $80^\circ$
**C)** $90^\circ$
**D)** $120^\circ$
**E)** Cannot be determined from the information given

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