I am pretty sure it would be massive because it is an English question. If you are doing a multiple choice question you should see which one fits the best. If could also be positive impact.
A. Antecedent would be the best answer.
A thing or event that existed before or logically precedes another.
Antecedent Example: The athlete extended a hand to his opponent.
Pronoun: His
Antecedent: Athlete
Answer:
to be a planet .. is the eight current planets have regular..
planets must be massive is Nasa explains...
A planet should have .. is for example the international...
Explanation:
