A Megalithic pit burial marked by a single large standing stone slab is called:

Correct option is D

1. Kodaikal: This is a hill station in Tamil Nadu, India, known for its natural beauty. It has no direct association with megalithic burial types.
2. Topikal: This term does not correspond to any known type of megalithic structure or burial.
3. Dolmen: A dolmen is a type of single-chamber megalithic tomb, usually consisting of two or more upright megaliths supporting a large flat horizontal capstone. While it involves large stones, it typically refers to a chamber tomb, not necessarily just a single standing stone marking a pit burial.
4. Menhir: A menhir (from Breton: maen "stone" and hir "long") is a large upright standing stone. These were erected individually as memorials, boundary markers, or to mark burial sites, including pit burials. A single large standing stone slab marking a burial fits the description of a menhir.

Hence answer is d.