To determine whether your patient has a virus based on what you're observing under the microscope, you would need to identify the structures you are looking at.
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If you see a structure that is not a cell, such as viral particles or typical viral structures (like capsids), then the appropriate conclusion would be d: "Yes, my patient has a virus, as this is a typical viral structure."
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If you see a bacterial or fungal cell, then you should conclude that your patient does not have a virus: b (for bacterial) or c (for fungal).
Without more specific information about what you are observing, it's not possible to definitively answer the question. Please use the characteristics of what you see to guide you to the correct conclusion.