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Which of the following is the most necessary for an electric field to exist?

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Which of the following is the most necessary for an electric field to exist?

(a) Current

(b) Potential difference

(c) Dielectric material

(d) Metal conductor

This question was posed to me during an online exam.

This intriguing question comes from Antenna Fundamentals topic in portion Antennas and Wave Propagation of Avionics

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The correct option is (b) Potential difference

For explanation I would say: The most important thing for an electric field to exist is a potential difference between two conductors. It is not that only metal conductors can produce an electric field, potential difference between fluids also produces electric fields.

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