
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 physics experiment determines the gravitational constant $G$ to be $6.67384$ with an uncertainty of $\pm 0.00021$. The researcher needs to report $G$ such that each digit in the reported value is significant. The most precise value the researcher can announce for $G$ is:
**A)** $6.67$  
**B)** $6.673$  
**C)** $6.674$  
**D)** $6.6738$

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