**A) 0.0707 m2**

B) 0.0616 m2

C) 0.0524 m2

D) 0.0491 m2

As per IS 1239 (Part 1)-2004 for Pipes, the internal diameter is 300 mm or 0.3 m.

The internal radius r = (Internal diameter/2) = 0.3/2 = 0.15 m

The internal cross-sectional area A = πr2

= π x (0.15)2

= 0.0707 m2

Therefore, option** A is the correct answer.**