Final answer:
One piece of evidence to support Parliament's concern about a Catholic taking the throne of England is the execution of King Charles I in 1649. The Glorious Revolution of 1688 also exemplifies Parliament's concern about a Catholic monarch.
Step-by-step explanation:
Parliament was opposed to a Catholic taking the throne of England due to the religious conflicts and political upheavals that occurred in the 17th century. One piece of evidence to support Parliament's concern is the execution of King Charles I in 1649. This marked the first time a reigning monarch had been brought before a legislative body and indicted for treason, highlighting the contentious relationship between king and Parliament. Additionally, the Glorious Revolution of 1688, where James II was overthrown for being Catholic, further exemplifies Parliament's concern about a Catholic monarch.