
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
Calculate $y = (\log_2 4)(\log_4 5)(\log_5 6)\cdots(\log_{39} 40)$.
A) $4 < y < 5$
B) $5 < y < 6$
C) $y = 6$
D) $6 < y < 7$
E) $y = 7$

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