A true moss is that -

Options

A. Which has.leafy, radially symmetrical body and grows in tufts. Plant body has an axis with spirally arranger' leaves
B. Which has a protonema stage and multicellular rhizoids with oblique septa
C. Both a and b
D. Which has vascular tissues

Answer

To determine what constitutes a true moss, we need to analyze the characteristics of mosses and the options provided in the question.

### Step-by-Step Solution:

1. **Understanding Mosses**: True mosses belong to the group called Bryophytes. They are non-vascular plants that reproduce via spores and have a dominant gametophyte stage in their life cycle.

2. **Analyzing the Options**:
- **Option 1**: "Which has leafy, radially symmetrical body and grows in tufts. Plant body has an axis with spirally arranged leaves."
- This description fits true mosses. They indeed have a leafy structure and grow in tufts, with leaves arranged spirally around a stem-like axis.

- **Option 2**: "Which has a protonema stage and multicellular rhizoids with oblique septa."
- This is also a characteristic of true mosses. The protonema is the first stage of the moss life cycle, developing from spores, and the multicellular rhizoids help anchor the moss to the substrate.

- **Option 3**: "Both A and B."
- Since both options 1 and 2 accurately describe true mosses, this option is also correct.

- **Option 4**: "Which has a vascular tissue."
- This option is incorrect because true mosses do not have vascular tissues; vascular tissues are found in higher plants like pteridophytes.

3. **Conclusion**: The correct answer is **Option 3: both A and B**, as both characteristics accurately describe true mosses.

### Final Answer:
A true moss is that which has a leafy, radially symmetrical body and grows in tufts, and also has a protonema stage and multicellular rhizoids with oblique septa. Thus, the correct option is **Option 3: both A and B**.