Final answer:
F+ bacteria initiate conjugation with an F plasmid that allows them to transfer genetic material. Hfr bacteria have an integrated F plasmid that can also transfer chromosomal DNA. The answer to the student's question is C) F+; Hfr.
Step-by-step explanation:
F+ bacteria contain an F factor or plasmid that is capable of initiating .
F+ cells have the F plasmid and can form a conjugation pilus to transfer genetic material to recipient cells.
Hfr bacteria contain an F plasmid that has integrated into the bacterial chromosome and can transfer not just the plasmid, but also parts of the chromosome during conjugation.
The correct answer to the student's question is therefore C) F+; Hfr.