Ahot air balloon exerts a force of 1200 n while
lifting a load of 800 n. which free-body force
diagram depicts the forces involved?

C

Explanation:

For the explained scenario in the free body force diagram definitely the two forces 1200 N and 800 N should present as they are the acting forces

So A & D rules out.

Then you must think of B & C.

You also know that the weight of the load is always acting downwards as that force is generated by gravitational field of Earth. So 800 N should be downwards not upwards. That rules out B.

So answer is C

(Free body diagram is shown in the graph)

their crystal patterns have been disrupted by stress

cant without the picture! ?