Which of the following graph for a body moving along a straight line is possible? Plz provide detailed answer

Dear student,

A body cannot have two different speeds at same instant of time. Hence options 1 and 3 are discarded.

Also negative speed of a body is not possible at any point of time. Hence option 2 is discarded.

However option 1 is a case of decelerated motion. Hence correct answer is option 1.