Final answer:
In response to the Tea Act, Mucius and other colonists were urged to boycott British goods and prepare for possible military action, as part of a broader sentiment against taxation without representation and monopolistic practices.
Step-by-step explanation:
The measure that Mucius urged colonists to take in response to the Tea Act was to boycott all British goods and prepare for possible military action. After the Tea Act of 1773, colonial anger and resentment were kindled, as the act reinforced the precedent of taxation without representation while granting a monopoly to the British East India Company. Colonists feared that the act was a ploy to force them to acquiesce to British taxes. Consequently, many in the colonies, led by groups like the Sons of Liberty and the Committees of Correspondence, spearheaded efforts to restrict the unloading and sale of British tea, sometimes by direct action, such as the famous Boston Tea Party, where tea was dumped into Boston Harbor as a profound act of protest.
In general, the sentiment expressed by members of the Sons of Liberty, such as the one from New York who stated that those "whoever shall aid or abet, or in any manner assist, in the introduction of tea from any place whatsoever, into this colony...shall be deemed an enemy to the liberties of America," encapsulates the collective colonial attitude: they were ready for drastic measures to preserve their liberties and autonomy from what they perceived as oppressive British policy.