How are the variables related at various points on the graph?

A
The tower begins with a height of 0, and each time a block is added, the height jumps the height of the block. The tower continues to be built indefinitely.

B
The tower begins with a height of 0, and each time a block is added, the height jumps the height of the block. The tower is completed when the fourth block is added, and so the height of the tower is constant from then on.

C
The tower begins with a height of 0, and each time a block is added, the height jumps the height of the block. The tower is completed when the third block is added, and so the height of the tower is constant from then on.

A) The height of the tower increases continuously with each block added.

B) The height of the tower increases until the fourth block is added, and then it remains constant.

C) The height of the tower increases until the third block is added, and then it remains constant.