What does 'pacing' mean?

[ConchitaS]

Synonym Search, Intermediate level

ESL/EFL Test #110 "Synonyms for wander", question 2

Hungry lions have been ......... the desert for a long time now.

(a) walking
(b) straying
(c) ranging
(d) pacing

Synonym Search, Intermediate level

ESL/EFL Test #110 "Synonyms for wander", answer 2

Hungry lions have been ranging the desert for a long time now.

Correct answer: (c) ranging
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What's the meaning of "pacing"? Thanks in advance.

Conchita

[Mister Micawber]

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Pace: to take slow, regular steps; to walk up and down nervously, as to expend nervous energy.
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Native English teacher at Mister Micawber's