
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
If $5^a + 5^b = 3^c + 3^d$ and $a, b, c, d$ are even integers, the number of integers among $a, b, c, d$ which can possibly be negative is:
A) 4
B) 3 
C) 2 
D) 1 
E) 0

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