Final answer:
The lack of aurora observed on Venus suggests that Venus lacks a strong magnetic field.
Step-by-step explanation:
The lack of aurora observed on Venus suggests that Venus lacks a strong magnetic field
Unlike Earth, which has a strong magnetic field that interacts with charged particles from the Sun to produce auroras, Venus has a very weak magnetic field. This weak magnetic field is not strong enough to generate and sustain auroras like on Earth. Therefore, option c is the correct answer.