Final answer:
The circumference of Earth, calculated using the diameter of 12,740 km, is approximately 40,000 km when rounded to two significant figures. This value does not match any of the options provided. If 'Tirth' is a different entity, the same formula applies with its diameter.
Step-by-step explanation:
The circumference of a circle can be calculated using the formula C = πd, where C is the circumference and d is the diameter of the circle. Given that the diameter of Earth is 12,740 km, we can apply this formula to find the Earth's circumference. Using π approximately equal to 3.14159, we can calculate the circumference as follows:
C = πd = 3.14159 × 12,740 km ≈ 40,030 km.
But since we need to express the answer in two significant figures, we round this value to 40,000 km. This is not one of the options provided in the question, which might indicate that there is a mistake in the question's options, or it is about a different subject named 'Tirth' rather than Earth's circumference. If 'Tirth' is a different entity with a known diameter, we would use the same formula but with the appropriate diameter to calculate its circumference.