The purpose of the preamble of the constitution is to

C - introduce and explain the core ideas of the government’s important principles.

Explanation:

Preamble = beginning, so the preamble of the Constitution should introduce the Constitution.

Also Edge 2021.

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.