<span>(It warms the very sickness in my heart)
When Laertes says this, it shows that there is an element of disease already making its way into his heart. Because of his father and sister's deaths, he has become sick, which reinforces the theme of decay and disease so prevalent in the play. </span>
D. They fear they will be murdered.
He keeps saying they will be safer and tha mt were they are now has "Daggers With Mens Smile." meaning there are mean who would be happy to stab them.
