
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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A research institute in Chongqing conducted a survey on the weight of middle school students across 38 districts and counties. The districts were divided into four groups, named Group A, B, C, and D, with the number of districts in each group being 4, 10, 16, and 8 respectively. If stratified sampling is used to select 9 districts, how many should be chosen from Group D?

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