
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 company has 750 employees, among which there are 350 young employees, 250 middle-aged employees, and 150 elderly employees. In order to understand the health condition of the employees in this company, a stratified sampling method is used to draw a sample. If there are 7 young employees in the sample, then the sample size is (      )  
A．7           B． 15           C． 25           D．35

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