Parsley is a seed-producing non-woody plant. It falls under the category of herbs.

Seed-producing non-woody plants refer to plants that reproduce through seeds and do not have a woody stem or trunk. Among the given options (a) Rose, (b) Mango tree, (c) Guava tree, and (d) Parsley, the correct answer is option (d) Parsley.

Parsley is a seed-producing non-woody plant. Let's understand why:

1. Definition of a seed-producing plant:
- A seed-producing plant is a plant that reproduces by producing seeds.
- Seeds are structures that contain the embryo of a future plant, along with a food source and a protective seed coat.
- These seeds are dispersed by various means and, under suitable conditions, germinate to give rise to new plants.

2. Parsley as a seed-producing plant:
- Parsley is a popular herb commonly used as a culinary ingredient.
- It belongs to the family Apiaceae and the species Petroselinum crispum.
- Parsley plants produce flowers, and after pollination, these flowers develop into seeds.
- The seeds of parsley are small and oval-shaped, typically brown or black in color.
- These seeds can be collected and used for propagation, or left on the plant to disperse naturally.

3. Woody vs. non-woody plants:
- Woody plants are characterized by having a hard, rigid, and thick stem or trunk made of wood.
- Examples of woody plants include trees and shrubs.
- Non-woody plants, on the other hand, have soft, flexible, and usually green stems.
- Examples of non-woody plants include herbs, grasses, and some flowering plants.

In conclusion, parsley is a seed-producing non-woody plant. It reproduces by producing seeds, and its stem is not woody like that of a tree or shrub.