
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 certain educational research institution in Chongqing conducted a survey on the weight of middle school students in Chongqing's 38 districts and counties. They were divided into four groups, A, B, C, and D, corresponding to 4, 10, 16, and 8 districts and counties, respectively. If 9 cities are to be selected using stratified sampling, the number of districts and counties that should be selected from group D is _____.

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