Write the next sentence in the following story.

How to prevent oily hair
Wash your hair less often.
While it may seem counterintuitive, washing your hair can actually cause excess oil production. One reason is because shampoo strips your head of natural oil, and your scalp reacts by producing still more.

Choices:
(a). Also, certain shampoos and conditioners, especially those containing silicone, can leave your hair with more oil or oil-like-substances. If you're used to washing every day, start cutting back slowly and skip only one hair washing per week..
(b). Try switching to a low-flow shampoo once in a while, or switching to a high-quality dry shampoo. When you shampoo, do so just before bed or on set..
(c). If you do wash your hair less often, consider using a straight paddle brush or a wide-head hair donut brush instead of a roller roller brush. Once your hair is clean and soft, you can rinse it and apply conditioner to your hair when needed..
(d). If you wash your hair less often, it will retain oil. This does not have to be a major irritant or problem, but it does have to apply a variety of power points... The answer should be
(a).