The metal which can be cut with a knife is:

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Sodium

Iron

Potassium

Copper

answer is B.

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Detailed Solution

The metal which can be cut with a knife is sodium.
Sodium(Na) has 1 electron in its valence shell. Being the first element of period 3 so it has a large size, so the force of attraction between particles is weak. The metallic bond of sodium is weaker than other elements. That’s why sodium is so soft that it can be cut with a knife. Sodium metal is stored in kerosene because it is highly reactive to air and water. Sodium chloride is a salt of sodium and is known as common salt or table salt.

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