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The more alkaline the shampoo, the _____ it is.

  1. Gentler

  2. Milder

  3. Softer

  4. Stronger and harsher

The correct answer is: Stronger and harsher

Alkaline shampoos are known for being stronger and harsher compared to acidic shampoos. This is because alkaline-based products have a higher pH level, making them more basic or caustic. A higher pH level breaks down the natural oils on the hair and scalp, leading to dryness and potential damage. Therefore, using an alkaline shampoo can result in a harsher and stronger effect on the hair, making option D the most accurate representation of the relationship between shampoo alkalinity and its effects. Options A, B, and C are incorrect because they suggest that alkaline shampoos are gentler, milder, and softer, which is not the case as explained.