What method disguises a malodor with a stronger, more pleasant odor?

Masking is the method that involves using a stronger, more pleasant odor to cover up or disguise an existing malodor. This technique relies on the principle that the human nose can become overwhelmed by stronger scents, thereby making the unpleasant odor less detectable. Masking agents typically include perfumes or fragrances that are designed to give a pleasant aroma, which can make the environment more tolerable while the source of the malodor is either removed or treated.

Sealing refers to the process of applying a sealant to surfaces to prevent odors from escaping, but it doesn't cover or disguise the malodor itself. Neutralizing involves a chemical reaction that alters the structure of odor-causing compounds, effectively eliminating the smell rather than just covering it up. Pairing, although less common in odor control discussions, would generally imply combining different scents or agents, but it does not specifically refer to the act of masking under the context of odor control.

Thus, masking specifically fits the definition of disguising an unpleasant odor with a more pleasant one, making this method the correct choice in this context.