Explanation
Correct sequence is :
Step 1 . Draw a line $$PQ$$ and take a point $$A$$ anywhere outside the line.
Step 2. Place the pointed end of the compass on $$A$$ and with an arbitrary radius, mark two points $$D$$ and $$E$$ on line $$PQ$$ with the same radius.
Step 3. From points $$D$$ and $$E$$, mark two intersecting arcs on either side of $$PQ$$ and name them $$R$$ and $$S.$$
Step 4. Join $$R−S$$ passing through $$A$$.
So the third step is $$3$$.
So the second step is $$2$$.
Option $$B$$ is correct.
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