I think it’s C but I’m not too sure. I’m sorry if it’s wrong :(
Answer:
Variation of natural phenomena is also a possible source of error.
Explanation:
Variation of temperature, humidity, gravity, wind, refraction, magnetic declination etc. are most common natural phenomena which may cause measurement errors. If they are not properly observed while taking measurements, the results will be incorrect.
Answer:
Second option.
Explanation:
Kepler's Third Law: the squares of the orbital periods of the planets are directly proportional to the cubes of the semi-major axes of their orbits.
May you please show a picture