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.

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.