(a) This graphs does not represent one dimensional motion, because, at the given instant of time, the particle will have two positions, which is not possible in one-dimensional motion.
(b) This graph does not represent one dimensional because, at the given instant of time, the particle will have velocity in one dimensional motion.
(c) It also does not represent one dimensional motion,because this graph tells that the particle can have the negative speed but the speed of the particle can never be negative.
(d) It also does not represent one dimensional motion, because,this graph tells that the total path whose length decreases after certain time, But total length of a moving particle can never decrease with time.
