Multi-select problem: How does the next paragraph end?

How to dress narrow windows
Measure the window horizontally to determine the width.
Hold your tape measure at the left side of your window, then stretch it across until it reaches the right side. Ensure the left side measurement starts at 0.

Options are:
(a). If your window is perpendicular, tape down the edge of the tape measure to the sill, when it reaches 90 degrees. For a straighter window, make a mark 5 feet (1.2 m) away from the face of the window.
(b). Then draw a series of marks across the window to know its width. This piece of tape may be stained, so you may use special cleaners, such as vaseline or strong household cleaner.
(c). The width of your window will depend on how wide you want your trim to be. For instance, you might want the window taller because you want your trim to be tall enough so that the trim is above the floor.
(d). Measure width of the inside trim of your window if you are planning to get blinds Measure the window vertically to determine the length. Hold the tape measure at the very top of your window, and pull it downwards until you reach the bottom.
(d).