Read the criteria i believe is the first step
The correct answer is Queen Gertrude is caught between her new husband and her son.
B is definitely incorrect because his father is dead so he cannot observe his conversation; C is incorrect because Gertrude believes Hamlet should blindly follow what Claudius has to say; D is incorrect because Hamlet hates Claudius.
This leaves us with sentence A - Gertrude has just lost her husband but she remarried immediately. Now, she is torn between her son whom she loves, and her new husband, who she feels she should obey.
Answer:
I don't know what I ought to do