
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 particle is projected vertically upward and the elevation in feet $s$ after $t$ seconds is given by the equation $s = 200t - 20t^2 + 50$. Determine the maximum elevation achieved.
A) 1000
B) 500 
C) 550
D) 600
E) 450

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