It acts as a template strand for reverse transcriptase:

Explanation

Option B is correct.Reverse transcriptase is an enzyme that is essential for HIV replication. Reverse transcriptase responsible for reverse transcription, during which viral genomic RNA is converted into viral dsDNA in cytoplasm of helper T-cells. The following steps take place in the reverse transcription process: 1) Initiation: Reverse transcriptase binds to the HIV RNA genome and recruits a primer, which is a short piece of RNA that is used to start DNA synthesis. 2)Elongation: Reverse transcriptase uses the primer to synthesize a DNA copy of the HIV RNA genome. 3) Termination: Reverse transcriptase terminates DNA synthesis when it reaches a specific sequence in the HIV RNA genome.When a retrovirus infects a cell, its RNA genome is reverse transcribed into DNA by the virus's reverse transcriptase enzyme. This DNA copy can then be integrated into the host cell's genome, where it can be replicated and expressed which act as template.