Can someone
choose the best definition for the term “solution”

The first option would be the best “solution” *wink wink* lol but a solition would make the the equation true from a math standpoint otherwise, if the varible couldn’t fit, it would be labeled as “no solution”

The first one for sure. A solution would be best classified as the variable that makes the equation true. The other answers don't really apply to its definition.

The  height must be greater han 300 ft above the ground, then d> 300
the inequality will be:
-16t²+1000> 300

we can solve this inequality.
  -16t²+1000> 300
-16t²> 300-1000
-16t²> -700
-t²> -700/16
-t²> -43.75
t²< 43.75
t< √43.75
t< 6.61  or  (0 ,  6.61)

answer: the inequality willl be : -16t²+1000> 300,  and the interval of time taken by the object to reach the height greater than 300 ft above the ground will be (0 , 6.61) seconds.