The correct option is
D R S Q T P
The first statement in the sequence should be the one that introduces a new topic. It should not be a continuation or extension of a topic.
R is first in the sequence: R is the only phrase that introduces a new topic. It talks about non-motorized transport modes. How they have drawn attention to it.
R is followed by S: S gives the reason for the point made by R. It says that they have drawn attention to such transports as they are overlooked in transport planning.
S is followed by Q: Q continues the point made by S. It says that they are overlooked as they are considered relics of a backward past.
Q is followed by T: T directly continues Q's point. It says that as they are considered relics, they are eventually replaced by fuelled transport.
T is followed by P: P gives an example for the point made by T. It says that non-motorized transports are replaced by fuelled ones just like they are in industrialized countries.
Thus, the correct sequence is R S Q T P. Hence, D is the correct option.