Conceptual, because that is the only adjective from the list.
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Answer:
A. First one with Sun at the center.
Explanation:
Aristarchus was a Greek scientist who proposed the theory that its not Earth which is fixed, its the Sun that has a fixed position and is placed at center where are all other planets are located at some distance from it and revolve around it. This theory is referred as "Heliocentric".
Answer:
hm...... not exactly sure
Explanation: