For the first question regarding the interpretation of the owl that Lady Macbeth claims to hear, the most fitting choice is:
Lady Macbeth is beginning to lose her sanity and only thinks she hears an owl shrieking.
This interpretation aligns with the theme of deterioration of mental stability in the play, particularly in Lady Macbeth as the weight of their actions begins to overwhelm her.
For the second question about Lady Macbeth's observance that the king looked like her father, the best interpretation is:
She reveals the fact that she is not capable of murdering someone.
This shows her internal conflict and how deeply the act of murder affects her, highlighting her vulnerability despite her earlier ruthlessness.