Viruses contain either DNA or RNA, not both or neither

Steps:

• Viruses have a single type of nucleic acid as genetic material: either DNA or RNA.
• Examine rows: Row 1 has both DNA and RNA (invalid); Row 2 has only DNA (valid); Row 3 has only RNA (valid); Row 4 has neither (invalid).
• The question asks for two different virus particles, so select one DNA virus and one RNA virus.
• Rows 2 and 3 match this, corresponding to option C.

Why C is correct:

• Viruses are defined by having exactly one nucleic acid type (Baltimore classification), so rows 2 and 3 correctly identify a DNA-only virus and an RNA-only virus.

Why the others are wrong:

• A includes row 1 (both nucleic acids, impossible for viruses).
• B includes row 1 (both nucleic acids, impossible).
• D includes row 4 (no nucleic acids, impossible).

Final answer: C