Explanation:

- Section 18 of the Indian Evidence Act deals specifically with *admissions by persons whose position must be proved as against party to suit* (such as agents, partners, etc.).

- Section 19 is about *admissions by persons expressly referred to by party to suit*.

- Section 16 relates to *explanation as to when previous conduct is relevant*, not admissions.

- Section 13 deals with *facts relevant when right or custom is in question*, not directly about admissions.

Correct Answer: Option 4, Section 18