'to put all one's eggs in one basket'

[Laura14]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #3 "A piece of cake", question 10

He always took advice from his parents about being careful and never put all his eggs in one basket.

(a) carried too much in one hand
(b) relied too much on one plan
(c) decided to do anything dangerous
(d) planned anything exciting

English Idioms and Expressions, Intermediate level

ESL/EFL Test #3 "A piece of cake", answer 10

He always took advice from his parents about being careful and never relied too much on one plan.

Correct answer: (b) relied too much on one plan

Your answer was: incorrect
He always took advice from his parents about being careful and never decided to do anything dangerous.
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Please could you explain to me this sentence?
Thank you

[Mister Micawber]

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The idiom is 'to put all one's eggs in one basket', which means to venture all of something that one possesses in a single enterprise.
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Native English teacher at Mister Micawber's