Your question: "the picture shows a professional diver with a mass of 93 kg from a 25 m high cliff. Earths Gravity is acting on the diver. Which statement best describes the reaction force to earths gravity in this situation?"

When we see the words "Which statement ... ", we know right away that there will be a list of choices, and we're expected to select our answer from that list.Strangely, the list of answer-choices for this question has been lost.Similarly, when we see the words "The picture shows ... ", it's hard to fightthe impulse to look around.  In the present situation, that's missing too.If the diver is just standing there, then the reaction force provided by the cliff against his feet must be exactly equal to his weight.  If the vertical forces actingon the soles of his feet were not balanced, then his feet would be acceleratingvertically.His weight is  (mass) x (gravity) =                      (93 kg) x (9.8 m/s²) = 911.4 newtons (about 205 pounds) . That's also the strength of the upward reaction force provided by the cliff.