Explanation:

- Section 73 of the Indian Evidence Act: This section allows for the comparison of various forms of writing and impressions with those that are admitted or proved to be genuine.

- Statement I: Comparison of signature. This refers to checking if a questioned signature matches a known one.

- Statement II: Handwriting. This involves examining if a sample of handwriting corresponds to a tested sample.

- Statement III: Seal of a person. Can be checked against a known seal to verify authenticity.

- Statement IV: Fingerprint impressions. Includes comparing fingerprint samples for verification.

All these statements are covered under Section 73.

- Option 1: Covers I, III, and IV. Misses II.

- Option 2: Covers II and IV. Misses I and III.

- Option 3: Covers I, II, and III. Misses IV.

- Option 4: Covers all statements.

Correct Answer: Option 4 - all of them