A leaf without petiole is-a. Sessileb. Subsessilec. Sub petiolated. Simple

A leaf without a petiole is called sessile.

Sessile: A leaf without a petiole is directly attached to the stem, without any stalk.
Subsessile: Refers to leaves with a very short petiole, almost absent, so they appear to be attached directly to the stem.
Subpetiolated: This term is not commonly used, but it could be interpreted similarly to subsessile, where the petiole is so short it is barely noticeable.
Simple: This term refers to the leaf structure, indicating it is not compound (not divided into smaller leaflets), but it doesn't directly pertain to whether the leaf has a petiole.
So, the correct option for a leaf without a petiole is sessile.