What does "stumble" mean?

[Rathor]

Synonyms Lesson, Advanced Level

ESL/EFL Test #106 "Synonyms for stagger and walk", question 8

The little boy ......... and almost fell down while chasing the ball, but he regained his balance again.

(a) blundered
(b) staggered
(c) stumbled
(d) limped

Synonyms Lesson, Advanced Level

ESL/EFL Test #106 "Synonyms for stagger and walk", answer 8

The little boy stumbled and almost fell down while chasing the ball, but he regained his balance again.

Correct answer: (c) stumbled
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How can I get the difference between them?

Rathor

[Mister Micawber]

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First, use a DICTIONARY. If you still don't understand a word, then ask here.
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Native English teacher at Mister Micawber's