Formal speeches differ from informal ones in that

A) formal speeches always include obscure,unfamiliar vocabulary.
B) formal speeches are always much longer.
C) formal speeches are often delivered from a stage or platform.
D) when delivering a formal speech,you should speak more rapidly.
E) they do not include visual aids.

Formal Speeches

Structured talks delivered to an audience, typically characterized by careful preparation and formal language.

Stage

A specific phase or period in a process or development.

Platform

A digital service or infrastructure that supports the development and deployment of applications, enabling users to create, run, and manage applications without dealing with the underlying infrastructure.