
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]


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In a high school with 500 students in the freshman class, there are 200 students with blood type O, 125 with blood type A, 125 with blood type B, and 50 with blood type AB. In order to study the relationship between blood types and color vision deficiency, a stratified sampling method is used to select a sample of 40 students. How many students with blood type O should be included in the sample?

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