In Talking to a Parent After the Loss of a Child

In talking to a parent after the loss of a child, the text advises that

A) you should change the subject when the parent mentions the child's name.
B) you should try to commiserate by saying that the child's case was bungled by the physicians.
C) you should avoid the parent because you are uncomfortable.
D) you should allow the parent to express grief without holding back.