what does "speak his mind" mean?

[Grace phils]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #4 "How Mary fell in love", question 7

In the end her neighbour decided to speak his mind.

(a) say exactly what he thought
(b) have a chat
(c) say a few words
(d) express a point of view

English Idioms and Expressions, Advanced Level

ESL/EFL Test #4 "How Mary fell in love", answer 7

In the end her neighbour decided to say exactly what he thought.

Correct answer: (a) say exactly what he thought
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what does speak his mind means

Grace-phils

[Tortoise]

Oh Guest,

You've done the exercise that gives you meaning of "speak his mind". I think there is no doubt that "speak one's mind" means "speak exactly what he/she thinks".