D.Neither an electric field nor a magnetic field✓ Correct
Explanation
X-rays are a form of electromagnetic radiation, consisting of high-energy photons that carry no electric charge. Since electric and magnetic fields exert forces only on charged particles (or moving charges), they cannot deflect uncharged photons. Therefore, X-rays travel in straight lines through electric and magnetic fields without being deflected. This property distinguishes them from charged particles such as electrons (cathode rays) or alpha particles, which can be deflected by such fields.
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