Concept: The question tests on basic Geometry
Solution:
Statement I: ∠PRQ = 180 - 40 = 40° Sum of angles on a straight line = 180°
∠PQR = 180 - 100 - 40 = 40°. Sum of angles of a triangle = 180°.
Statement II: ∠PQR = 40°
So ∠PQR = ∠QPS = 40°. Alternate angles between 2 parallel lines cut by a Transversal.
Statement III: ∠PRQ = 40°
So ∠PRQ = ∠RPT = 40°. Alternate angles between 2 parallel lines cut by a Transversal.
All 3 angles = 40°
Option E