The scientist who prepared hydrogen by the action of dilute acids on metals:

Cavendish

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Joseph Black

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Priestley

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Scheele

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Solution

The correct option is D
Scheele

Explanation for the correct option:
(d) Scheele was a German chemist who prepared hydrogen by the action of dilute acids on metals.
Explanation for the incorrect options:
(a) Henry Cavendish isolated Hydrogen (H) from the air left after the separation of Nitrogen (N) and Oxygen (O) gas.
(b) Joseph Black was a Scottish chemist who discovered Magnesium (Mg).
(c) Priestley is credited for the discovery of oxygen.
Hence, option (d) is correct.

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