The complete proverb is “All that glitters is not gold.” This famous saying means that not everything that looks precious or true turns out to be so; appearances can be deceptive.
This phrase dates back to at least the 12th century, popularized in literature by Shakespeare’s play “The Merchant of Venice,” which uses the variation “All that glisters is not gold.”
In the proverb, “gold” is used metaphorically to signify something valuable or of high worth.
The proverb warns people to look beyond the superficial—just because something shines or looks appealing doesn’t guarantee it has true value.
The other options—Silver, Lead, Copper—are incorrect because the idiomatic expression specifically uses “gold.”
Hence, the correct word to complete the proverb is Gold, making option (C) correct.