The correct answer is B. she is deeply distraught by the sight of her murdered husband.
When Hecuba's husband was murdered, she was terrified, which is evident by the following line: The instant burst of clamour that she made. This means that she started screaming upon seeing her dead husband.
The reason why this excerpt was included in Hamlet was to show the difference between Hecuba's reaction to her husband's death, and that of Gertrude when her husband was murdered.