Priya is taller than Tiya and shorter than Siya. Thus, Siya>Priya>Tiya. Riya is shorter than Siya and taller than Priya. Thus, Siya>Riya>Priya>Tiya. Riya is taller than Diya, who is shorter than Tiya. Thus, Siya>Riya>Priya>Tiya>Diya. Hence, option C is the correct answer.