Amoebiasis is transmitted by

The correct option is "All of the above".

Amoebiasis (also known as amoebic dysentery) is an intestinal infection caused by the microscopic protozoan parasite Entamoeba histolytica. The transmission of this parasite occurs primarily via the faecal-oral route through several pathways:
1. Faecal contamination of drinking water and food: This is the most common mode of transmission. Cysts of the parasite are passed in the faeces of an infected person. If these cysts contaminate drinking water or food supplies (often due to poor sanitation or sewage treatment), anyone consuming the contaminated water or food becomes infected.
2. Direct contact with dirty hands: Poor personal hygiene, such as not washing hands thoroughly after using the toilet or before handling food, can lead to the direct transfer of infective cysts from hands to mouth or to shared surfaces.
3. Sexual contact: Amoebiasis can also be transmitted sexually, particularly through oral-anal contact, where cysts can be directly transferred from one partner to another.

Because all three listed pathways represent valid routes of transmission for the parasite, the comprehensive correct answer is indeed "All of the above".