Final answer:
The English Parliament had emerged as a powerful legislative body with significant influence by the early fourteenth century. It was designed to represent the interests of the people and had the authority to make or repeal any law under the UK's unwritten constitutional principles.
Step-by-step explanation:
By the early fourteenth century, the English Parliament had emerged as Option 3: A powerful legislative body with significant influence. The creation of the Parliament replaced the Great Council of the king's vassals and high clergy, and aimed to represent the interests of the people (nobles, clergy, and commoners). Even Kings asked for Parliamentary approval on laws and tax increases, making them a substantial force in governance.
Furthermore, Parliament held the unwritten constitutional principles of the UK, giving them the authority to make or repeal any law. Over time, this body further established itself as a powerful player in English Politics. Regardless of any limitations placed on them, they retain the ability to repeal these conditions, thus asserting their ultimate power.
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