Entamoeba histolytica is a parasite that is primarily found in the intestines of humans. It is an invasive parasite that can cause a disease called amebiasis. The parasite is transmitted through the ingestion of contaminated food or water. Once inside the body, it can travel to the intestines and cause symptoms such as diarrhea, abdominal pain, and bloody stools. In some cases, it can invade other organs like the liver, causing abscesses. However, the primary habitat of Entamoeba histolytica is the intestines. It is important to note that while the parasite can potentially affect other organs, it is most commonly found in the intestines. Therefore, option 2, intestines, is the correct answer for this question.