Choose the most appropriate answer.
A tadpole develops into an adult frog by the process of
(i) fertilization
(ii) metamorphosis
(iii) embedding
(iv) budding

Options

A. Fertlization
B. Metamorphosis
C. Embedding
D. Budding

Explanation

To answer the question about how a tadpole develops into an adult frog, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Life Cycle of Frogs**:
- Frogs undergo a complex life cycle that includes several stages: egg, tadpole (larval stage), and adult frog.

2. **Identifying the Tadpole Stage**:
- The tadpole is the larval form of the frog, which is typically aquatic and has a tail, resembling a fish.

3. **Defining Metamorphosis**:
- Metamorphosis is the biological process through which an organism transforms from one developmental stage to another, involving significant morphological changes. In frogs, this includes the transition from a tadpole to an adult frog.

4. **Evaluating the Options**:
- (i) Fertilization: This is the process of combining male and female gametes to form a zygote. It does not describe the transformation of a tadpole into a frog.
- (ii) Metamorphosis: This is the correct process that describes the transformation from a tadpole to an adult frog.
- (iii) Embedding: This term is not relevant to the development stages of frogs.
- (iv) Budding: This is a form of asexual reproduction and does not apply to the life cycle of frogs.

5. **Conclusion**:
- Based on the definitions and understanding of the life cycle, the most appropriate answer is (ii) metamorphosis.

### Final Answer:
The tadpole develops into an adult frog by the process of **(ii) metamorphosis**.

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