The correct option is C celestial
Terrestrial means of the land. The opposite of land is space. "Celestial" means of the space. Hence, Option D is correct. Among the rest of the options, abnormal means deviating from what is normal or usual, typically in a way that is undesirable or worrying, marvellous means causing great wonder; extraordinary, amphibious means relating to, living in, or suited for both land and water. These options do not express this antonym, hence incorrect.