
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
On a trip from the United States to Canada, Michael took $d$ U.S. dollars. At the border, he exchanged them all, receiving $6$ Canadian dollars for every $5$ U.S. dollars. After spending $80$ Canadian dollars, he had $4d/5$ Canadian dollars left. What is the sum of the digits of $d$?
A) 2    
B) 3    
C) 4    
D) 5

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