Answer:
The correct options are
B
∠
2 =
∠
5
C
∠
4 =
∠
6
(A)
∠
1 =
∠
4 (vertically opposite angles)
This condition alone is not sufficient.
(B)
∠
2 =
∠
5 (corresponding angles)
If two corresponding angles are equal, then the lines are said to be parallel.
(C)
∠
4 =
∠
6 (Alternate interior angles)
If two alternate interior angles are equal, then the lines are said to be parallel.
(D)
∠
1 =
∠
5
This condition is not right.