What plan do polonius, Claudius and Ophelia now put into action
The correct answer is:
Claudius, Polonius, and Ophelia make a plan so that Claudius and Polonius will hide as Ophelia will talk to Hamlet. Ophelia is supposed to test Hamlet's love, to see how he reacts to her when she returns his love letters, which is a form of insult. Ophelia is going to talk to Hamlet and try and figure out what is wrong with him while Claudius and Polonius spy on them.