This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to hang pencil pleat curtains
Pick curtains that are twice the length of the pole or track.
Use a measuring tape to measure the length of your pole or track. The width of the curtains you choose should be double the length of the pole or track.

Options:
(a). The room will look less symmetrical if it's not crowded, so choose smaller curtains to create the illusion of a smaller space. Have the curtains at least 6 inches (15 cm) apart.
(b). If your pole or track has legs, measure them by sliding the ruler across your length of the pole or track. The length of your curtains should be less than the length of the track.
(c). For oval and triangular curtains, go for a longer pole. For square or rectangular curtains, choose curtains that are 1/4 inch (0.64-1.27 inches).
(d). If the curtains are not wide enough, they will not fit the pole once they are scrunched. For example, if the pole is 2 feet (0.61 m), then pick curtains that have a width of 4 feet (1.2 m).
The answer is:
(d).