Which words help you to determine the meaning of the word declerate in paragraph 3 ?

There is nothing attached to the question but this is the definition.

verb (used with object), de·cel·er·at·ed, de·cel·er·at·ing. to decrease the velocity of: He decelerates the bobsled when he nears a curve. to slow the rate of increase of: efforts to decelerate inflation.

Edit: reduce or cause to reduce in speed.

"the train began to decelerate"

the answer is c i believe