Meaning of "stick out his neck"

[Chelsea]

English Language Tests, Intermediate level

ESL/EFL Test #217 "American English Idioms", question 6

The deal did not seem honest and Ron did not want to stick out his neck and risk everything until he was sure about every last detail. What is the meaning of 'stick out his neck?' .........

(a) to make oneself vulnerable
(b) to make oneself unbeatable
(c) to pry into other people's business
(d) to comprehend an idea

English Language Tests, Intermediate level

ESL/EFL Test #217 "American English Idioms", answer 6

The deal did not seem honest and Ron did not want to stick out his neck and risk everything until he was sure about every last detail. What is the meaning of 'stick out his neck?' to make oneself vulnerable

Correct answer: (a) to make oneself vulnerable
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meaning of "stick out his neck", please!

Chelsea

[Mister Micawber]

.

[Prezbucky]

to take a risk ("risk" implying the possibility of a negative outcome).
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Billie Jean is not my lover. Hee.