HIV primarily targets and infects CD4+ T cells (also known as T4 lymphocytes), which are a type of white blood cell important for the immune system's functioning. As HIV infects and destroys CD4+ T cells, it weakens the immune system, making the individual susceptible to various opportunistic infections and illnesses, leading to the development of AIDS when the immune system is severely compromised.
So, the correct option is (C): T4 lymphocytes

Study the chemical structure of an addictive drug shown below and answer the questions that follow.
Given below are two statements:
Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA.
Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.
In the light of the above statements, choose the most appropriate answer from the options given below: