Final answer:
A (A) Pilgrim is a Puritan who separated from the Church of England to form a new church group, establishing the Plymouth Colony in 1620.
Step-by-step explanation:
The Puritan who left the Church of England to form a new church group was a Pilgrim. Pilgrims were a subset of Puritans known as Separatists because they sought to separate from the Church of England entirely, rather than reform it as other Puritans aimed to do.
The Pilgrims founded the Plymouth Colony in 1620 in present-day Massachusetts, signing the Mayflower Compact, which presented a religious rationale for colonization.
Unlike the broader group of Puritans, who believed the Church of England could be purified, the Pilgrims established their own congregations that followed the teachings of John Calvin, reflecting their intentions to create communities of reformed Protestantism.