Afault moves because it is under compression.

Reverse

Explanation:

A fault is a planar or slightly curved fracture in the rocks of the Earth’s crust, where tension or compression causes the displacement of the rocks. There are three kinds of faults:

Normal faults, formed by vertical compression when the hanging wall drops down. The forces in these faults pull the sides apart. Reverse faults form horizontal compressional forces when the hanging wall moves up, pushing the sides together. Transcurrent or Strike-slip faults, also known as wrench or lateral, have walls that move sideways, they release energy through horizontal rock displacement.

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In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.

The correct answer is a.