A person's first speech

A. Preface

B. Maiden

C. Opener

D. Extempore

Answer: Option B

Solution(By Examveda Team)

One word substitute is Maiden.

Preface: an introduction to a book, typically stating its subject, scope, or aims.
Maiden: being or involving the first attempt or act of its kind.
Opener: a device for opening something, especially a container.
Extempore: spoken or done without preparation.