Question

to drive out foreign influences, the main thing the boxers did was to
recruit members openly.
oppose any kind of immigration.
force closure of all the ports in china.
kill foreigners, missionaries, and chinese christians.

Explanation:

The Boxers, also known as the Yihetuan, were a secret - society movement in China in the late 19th - early 20th century. They were anti - foreign and targeted foreigners, missionaries, and Chinese Christians as part of their efforts to expel foreign influence. They did not recruit members openly as they were initially a secretive group. Their focus was not on immigration in general but on foreign presence and influence. Closing all ports was not their main action.

Answer:

kill foreigners, missionaries, and Chinese Christians.