
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
Sally now has five red cards numbered $1$ through $5$ and five blue cards numbered $4, 5.5, 6, 7, 8$. She attempts to stack the cards so that the colors alternate and each red card divides evenly into each neighboring blue card (where possible since 5.5 isn’t an integer). How does she arrange the cards, and what is the sum of the numbers on the middle three cards?
A) 15
B) 16
C) 17
D) 18

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