Expression 'Make their minds up'

[Nino]

English Language Tests, Intermediate level

ESL/EFL Test #274 "Reaching agreement", question 2

For them it's very difficult to decide and make their ......... up at times like general elections.

(a) ideas
(b) thoughts
(c) beliefs
(d) minds

English Language Tests, Intermediate level

ESL/EFL Test #274 "Reaching agreement", answer 2

For them it's very difficult to decide and make their minds up at times like general elections.

Correct answer: (d) minds
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WHICH ANSWER IS CORECT? WHY?

Nino

[Alan]

The correct answer is: 'Make their minds up' which means 'make a decision'.

Alan
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