
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 rectangular planting area is to be enclosed on three sides using a $120$ meter stone wall as one side. Posts are to be placed every $10$ meters along the fence, including at the points where the fence connects to the stone wall. The area to be fenced measures $50$ m by $80$ m. How many posts are required in total to enclose the area?
A) 17
B) 18
C) 19
D) 20
E) 21

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