meaning of "down-to-earth sort of person"

[Emil]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #17 "Down to Earth", question 5

In contrast to her husband she's a very down-to-earth sort of person who manages to control his wild ideas.

(a) cynical
(b) boring
(c) clever
(d) practical

English Idioms and Expressions, Advanced Level

ESL/EFL Test #17 "Down to Earth", answer 5

In contrast to her husband she's a very practical sort of person who manages to control his wild ideas.

Correct answer: (d) practical
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what is it? explain please.

Emil

[Mister Micawber]

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'Down-to-earth' = practical, sensible.
.
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Native English teacher at Mister Micawber's