C. 308 cm
Feedback The option should be divisible by ‘11’ because ‘p’ has been used in finding its circumference.
One of the parameters is a higher power of 7. Thus, we need to find the only option that is a multiple of 7. If, however, we find more than one option that is a multiple of 7, we need to go through fundamentals.
Among the options, 308 and 407 are both multiples of 11. However, only 308 is a multiple of 7. So circumference of the circle = 308 cm.
We can test this as follows:
Circumference of circle = 2pr cm
= 2 × (22/7) × 7 × 49 cm
= 2 × 22 × 7 cm