The British practice of impressment, which involved forcibly conscripting American sailors into the British navy, most infuriated Americans and led to significant tensions culminating in the Embargo Act of 1807. Therefore, option A is correct.
The aspect that most infuriated Americans about the way British ships interfered with American trading ships was impressment. Impressment involved the British navy capturing American ships on the high seas and forcing their sailors into service for the Royal Navy.
This practice rose to prominence and ignited anger when in 1807, the HMS Leopard, a British warship, attacked the U.S. naval ship Chesapeake off the coast of Norfolk, Virginia, boarded it, and took four sailors.
The U.S. response was the Embargo Act of 1807, an attempt to stop Britain and France from seizing American ships by banning all American ships from leaving their ports, which led to significant economic repercussions for American commerce and trade.