
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
Claudia has 12 coins, which are either 10-cent coins or 25-cent coins. She can make exactly 21 different values with combinations of one or more of her coins. How many 25-cent coins does Claudia have?
A) 6
B) 7
C) 8
D) 9

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