Psilophytes, Tycophytes, horsetails, and ferns are .......... plants :
(a) multicellular aquatic
(b) seedless vascular
(c) haploid dominant
(d) seed-bearing vascular

Options

A. multicellular aquatic
B. seedless vascular
C. haploid dominant
D. seed-bearing vascular

Explanation

To solve the question regarding the classification of Psilophytes, Lycophytes, horsetails, and ferns, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Groups**: The question lists four groups of plants: Psilophytes, Lycophytes, horsetails, and ferns. We need to determine what classification they fall under.

2. **Understand Pteridophytes**: All four groups mentioned are part of the Pteridophytes. Pteridophytes are known as the first seedless vascular plants. They have vascular tissues (xylem and phloem) that allow for the conduction of water, minerals, and nutrients.

3. **Analyze the Options**:
- (a) **Multicellular aquatic**: This does not apply as these plants are primarily terrestrial.
- (b) **Seedless vascular**: This accurately describes Psilophytes, Lycophytes, horsetails, and ferns, as they do not produce seeds and possess vascular tissues.
- (c) **Haploid dominant**: This is incorrect; while they have a haploid phase, they are not haploid dominant like some other groups (e.g., mosses).
- (d) **Seed-bearing vascular**: This is incorrect as these plants do not produce seeds.

4. **Conclusion**: Based on the analysis, the correct classification for Psilophytes, Lycophytes, horsetails, and ferns is (b) **seedless vascular**.

### Final Answer:
(b) seedless vascular