Sometimes it is convenient to construct a system of units so that all quantities can be expressed in terms of only one physical quantity. In one such system, dimensions of different quantities are given in terms of a quantity X as follows: [position] = [X]; [Speed] = [X]; [acceleration] = [XP]; [Linear momentum] = [X]; [force] = [X]. Then (A) a+p=2B (C) p-q+r=a (B) p+q-r=B (D) p+q+r=B