Explanation:

- Efface: This means to erase or remove something as if by rubbing. It can also mean to make oneself inconspicuous or to cause something to fade or disappear.

- Option 1: Weaken: This means to make something less strong or powerful. It doesn't directly match the meaning of efface.

- Option 2: Cause to fade: This means to make something disappear gradually. Efface is often used in this context, such as when something is wiped away or made less noticeable.

- Correct Answer

- Option 3: Scorn: This means to treat with contempt or disdain. It has no direct connection with the meaning of efface.

- Option 4: Design: This involves creating or planning something with a specific purpose or function. It's not synonymous with efface.

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