D)MRS. PETERS (starts to speak, glances up, where footsteps are heard in the room above. In a low voice.)
This stage direction most adds to the suspenseful tone. When Mrs. Peters pauses her dialogue to look up, it shows that something isn't quite right. After the footsteps are heard, Mrs. Peters continues speaking, but in a low voice. This indicates that what she is saying isn't meant to be heard by everyone. The secrecy creates a suspenseful tone. Merely speaking the other woman, shaking one's head, or arranging pans do not give the feeling of suspense.
After reading the stage directions from the play "Trifles," by Susan Glaspell, we can say the one that most adds to the suspenseful tone is:
D) MRS. PETERS (starts to speak, glances up, where footsteps are heard in the room above. In a low voice.)
Stage directions are instructions included in parentheses that indicate how an actor should move around the stage, how their tone of voice or gestures should be like, etc. Stage directions can also indicate clothing and setting.
Among the given stage directions, there is one that adds to the suspense in the play "Trifles". It is the one in letter D, "(starts to speak, glances up, where footsteps are heard in the room above. In a low voice.)
Imagine you are talking to someone, but that person stops talking as soon as they hear a noise. Then, they begin to talk in a hushed voice. That would make you curious, even suspicious, about what the person has to say and why they think no one else should hear it.
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