Final answer:
The nematode filariform larva with a short buccal cavity is characteristic of Strongyloides stercoralis, which causes strongyloidiasis and is transmitted from soil through the skin.
Step-by-step explanation:
The nematode filariform larva with a short buccal cavity that you are asking about is characteristic of Strongyloides stercoralis, which is responsible for causing strongyloidiasis. This condition occurs when the larvae penetrate the human body through the skin, often through the feet, and complete their life cycle by traveling to the lungs and then to the intestine. Unlike Ascaris lumbricoides, which is transmitted via contaminated food or water, Strongyloides stercoralis has a direct skin-to-intestine route. Trichuris trichiura is another nematode but causes trichuriasis and is transmitted by ingestion of soil-contaminated organisms. Therefore, the correct answer to your question is B) Strongyloides stercoralis.