Concept: The question tests on the fundamentals of geometry (lines and angles)

Solution:
 
A new og 2021 question

St(1):- r = s

Vertically opposite angles in any two intersecting lines are equal.

It does not give us enough information to determine if l1 || l2 (Insufficient)
 

St(2):-t = u

Vertically opposite angles in any two intersecting lines are equal.

It does not give us enough information two determine if l1 || l2 (Insufficient)
 

Combining both;

r=s and t = u are true for two intersecting lines (Vertically opposite angles in intersecting lines are equal)

However, no unique information can be deduced for angles s and t / r and u. (Insufficient) option (e)