Question

Neptune _____.

is a terrestrial planet
has a nearly horizontal axis
was discovered by mathematical calculations
is the largest planet in the solar system

Answer 1

C. Was Discovered by Mathematical calculations

Step-by-step explanation:

Terrestrial Planets are Inner Planets (Mercury,Venus,Earth,Mars) and Neptune is an ice giant or gas giant, Neptune is also not the largest planet in the solar system, I believe that's Jupiter. I don't know for sure if Neptune has a horizontal axis but my best guess is C. I hope this helps! :^)