Final answer:
The circumference of the Sun is calculated using the formula 2πR, with the radius measured in kilometers, and is approximately 4.37×106 km in scientific notation.
Step-by-step explanation:
The circumference of the Sun can be calculated using the formula for the circumference of a circle, which is 2πR, where R is the radius of the Sun. To express this in scientific notation, you have to use the radius of the Sun in kilometers and then apply the formula. Using the radius of approximately 696,340 km, the circumference is calculated to be 4,370,399 km, which can be rounded and written in scientific notation as 4.37×106 km. Therefore, the correct answer is B) 4.379 x 106 km.