Answer:
Option B and D
Explanation:
Given are four options and we have to select the one which form a straight angle.
The given options are
A. Vertical Angles ... Vertical angles are formed when two lines intersect and hence cannot combine to form a straight angle. Incorrect option.
B. Supplementary Angles ... Supplementary angles are a pair of angles which add upto 180 degrees and hence they form a straight angle. Correct option
C. Complementary Angles ... These pair add up to 90 degrees and cannot combine to form a straight angle. .. Incorrect
D. Linear Pair ... A linear pair is a pair of angles formed on a straight line and hence correct option.