What is conservative in terms of politics here?

[Thameem]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #257 "US Government Questions Test (5)", question 9

Usually, ......... political parties are more resistant to change.

(a) liberal
(b) conservative
(c) socialist

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #257 "US Government Questions Test (5)", answer 9

Usually, conservative political parties are more resistant to change.

Correct answer: (b) conservative

Your answer was: incorrect
Usually, socialist political parties are more resistant to change.
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what is conservative in terms of politics here?

[Mister Micawber]

Please look HERE and find the definition that applies to politics and politicians.
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Native English teacher at Mister Micawber's