**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)**