What's the speak up means

[Guest]

ESL/EFL Test "The Bells", question 4

Sorry you'll have to speak ..........

(a) to
(b) up
(c) along
(d) through

ESL/EFL Test "The Bells", answer 4

Sorry you'll have to speak up.

Correct answer: (b) up

Your answer was: n/a
_________________________

what's the speak up means?
thanks

[Alan]

Hi,

Speak up means speak louder, which someone says if they don't hear what you say the first time.

Alan
_________________
English as a Second Language
You can read my ESL story The way you write it