Final answer:
The line "This is a sorry sight" is spoken by Macbeth in Shakespeare's play Macbeth, Act 2, Scene 2, as he reacts to the murder of King Duncan.
Step-by-step explanation:
The line "This is a sorry sight" is said by Macbeth in Act 2, Scene 2 of Shakespeare's play Macbeth. After Macbeth commits the murder of King Duncan, he looks at his hands, covered in blood, and utters this line, indicating that the sight of his bloody hands fills him with sorrow and regret. Lady Macbeth quickly dismisses his feelings as foolishness, implying that feeling regret is an impractical response to the situation they have orchestrated.