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 fight
the 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 acting
on the soles of his feet were not balanced, then his feet would be accelerating
vertically.

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.

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.