Where would you expect light waves to move fastest? A. On a mountaintop
B. Under the sea
C. Through an iceberg
D. In space

Id say under the Sea

Explanation:

im thinking A because light waves move fastest through vacuums and air and slowest through like water or mostly a liquid so it can't be C or B because those are underwater and anything that touches the ground doesn't move faster or if im wrong im just dumb but yea A im guessing.

definitely a for sure. ill see and update if i get the answer

the answer i chose to believe is 'harmony'