What does platform mean in this sentence?

[Thameem]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #257 "US Government Questions Test (5)", question 8

A ......... is a stance or statement containing a political party's thoughts, beliefs and plans put forth prior to an election.

(a) constituent
(b) fund-raiser
(c) platform

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #257 "US Government Questions Test (5)", answer 8

A platform is a stance or statement containing a political party's thoughts, beliefs and plans put forth prior to an election.

Correct answer: (c) platform

Your answer was: incorrect
A constituent is a stance or statement containing a political party's thoughts, beliefs and plans put forth prior to an election.
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what is platform means on this sentence? when we use this platform?

[Linda]

Hello,
A platform is a stance or statement containing a political party's thoughts, beliefs and plans put forth prior to an election.
This term is usually used when speaking about politics and party views.
_________________
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[Torsten]