The correct answer is: C. 12.30 m x 7.66 m
The badminton court for singles is a rectangular area 12.30 m long and 6.10 m wide, divided by a net 1.55 m high. The court is surrounded by a 40 cm wide outer boundary line. The service courts are 3.96 m long and extend from the net to the back boundary line. The short service line is 6.40 m from the net and the long service line is 7.66 m from the net. The doubles court is the same size as the singles court, but with an additional service area on each side of the net, 6.10 m long and 3.96 m wide.
Option A is incorrect because it is the measurement of the badminton court for doubles. Option B is incorrect because it is the measurement of the badminton court for doubles, but without the additional service area on each side of the net. Option D is incorrect because it is the measurement of the badminton court for singles, but without the short service line and long service line.