Final answer:
RuvC is the enzyme that nicks and resolves Holliday junctions in bacterial cells, and the correct option is 'c) RuvC'.
Step-by-step explanation:
The enzyme RuvC nicks and resolves Holliday junctions during the process of recombination in bacteria. Holliday junctions are a critical intermediate structure formed during the homologous recombination, which is a process cells use to repair breaks in DNA or to exchange genetic material during meiosis. The RuvC enzyme recognizes the Holliday junction structure and introduces nicks on opposing strands, allowing the junction to be resolved into two separate DNA helices.