The most likely impact of seeing the image described in your options would be:
By confirming the repressive actions of the British government, the engraving would increase the desire to rebel against it.
This response aligns with the historical context of American colonial sentiment leading up to the Revolutionary War. Engravings and illustrations at the time were powerful tools for propaganda, and depictions of British oppression often galvanized public outrage and support for rebellion among the colonists.