What kind of clause is the clause in dark type?

why they feel so upset concerns their families.

a. adjective clause
b. adverb clause
c. noun clause
d. independent clause

I think it’s A because it’s saying it upset

Which statements describe the relationship of earth and its moon? check all that apply.the moon orbits earth following a nearly circular path.the gravitational pull of earth on the moon is parallel to the velocity of the moon.the moon orbits earth in 1 earth day.the same face of the moon always points toward earth.the moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from earth