Final answer:
The United States first got involved in Hawaii through various means, including the arrival of missionaries and the settlement of pineapple and sugar planters. They also wanted a port and were interested in Hawaii's sugar industry.
Step-by-step explanation:
The United States first got involved in Hawaii through various means. American Protestant missionaries arrived in the 1840s, and American pineapple and sugar planters settled there, gradually gaining control of the islands. The US also wanted a port to refuel ships, and they were interested in Hawaii's sugar industry, which they supported through trade agreements. Therefore, the correct answer is option D: all of the above.