I think the anwser is 3)calculus
Answer:
The acceleration of the train is 5 m/s².
Explanation:
Acceleration is the change in velocity over a given time interval.
Therefore, acceleration is given as:

Where,
are initial and final velocities and
is the time interval.
Here, 
This gives,

Therefore, the acceleration of the train is 5 m/s².
It is b because more hurricanes form more when El Niño is present