UK History: Chapter 8, Exercise 1 — Possible Solution
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THE THREE CAUSES
1. Religion: Charles I's attempt to impose High Anglican practices, which led
   to the Bishops' Wars when applied to Scotland.
2. Taxation: methods such as ship money.
3. Royal power: Parliament's wish to constrain what it saw as excessive
   authority.

WHAT IS NOT TOLD
The source lists them together and does not rank them, so the chapter cannot
say which mattered most.