Answer:
A. Serious.
Explanation:
"Brushing aside her heavy bangs
Trembling hands
Dread filled the room"
By the use of the various words such as "heavy, trembling and dread", everything suggests the seriousness and heavy air of the situation. They can not be associated with any of the other options given, given the type of situation that is presented in the three lines. They are more on the solemn, absorbed and frightening and serious tone.
