Which of the following tissues ensures that food made in the leaves is delivered to all plant parts?

The correct option is Phloem.

Plants have a specialized vascular system composed of two main types of transport tissues: xylem and phloem. Each of these tissues has a distinct and essential role in the survival of the plant:
1. Phloem: This tissue is responsible for translocation, which is the process of transporting organic nutrients—primarily sucrose (food) made during photosynthesis in the leaves—to all other parts of the plant, including the roots, stems, flowers, and fruits.
2. Xylem: This tissue is responsible for transporting water and dissolved minerals absorbed from the soil by the roots upward to the rest of the plant.
3. Mesophyll: This is the inner tissue of a leaf, containing chloroplasts where photosynthesis actually takes place, rather than a transport system.
4. Epidermis: This is the outermost cellular layer that covers and protects the leaves, stems, roots, flowers, and seeds of a plant.

Therefore, the tissue that specifically ensures food made in the leaves is delivered to all plant parts is the phloem.