What is the displacement of the particle in the time interval 5 seconds to 8 seconds? 0 meters 1.5 meters 3 meters 7 meters

The displacement of the particle in the time interval 5 seconds to 8 seconds will be 1.5 meters. 
Displacement is a vector quantity; meaning it has both magnitude and direction; magnitude being the distance between the interval at 5 seconds and position at 8 seconds, while the direction is from position at 5 second to position at 8 second. This is irrespective of the route followed during the time interval.