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OPTION A.

Step-by-step explanation:

First, in order to solve this exercise, it is important to know the definition of "Cross section".

A Cross-section is defined as the shape obtained when a plane intersects a 3-dimensional figure.

A Regular square pyramid has a square as its base and its faces are four congruent Isosceles triangles.

Therefore, if a plane slices a Square pyramid through the top vertex, theb figure obtained is an Isosceles triangle (which is  a triangle that has two sides of equal length).

Then, you can conclude that the options that shows the best description of the cross-section obtained by slicing the given Square pyramid  through the top vertex, is the Option A.

b.-4 units

all you   do is count how many times you move