At the Hardy house there was great consternation when Aunt Gertrude saw Joe helping Frank up the stairs.

Answer: Option A

Surprise : an unexpected or astonishing event, fact, etc.
Panic : sudden uncontrollable fear or anxiety, often causing wildly unthinking behaviour.
Gaiety : the state or quality of being light-hearted or cheerful.
Satisfaction : fulfilment of one's wishes, expectations, or needs, or the pleasure derived from this.
Consternation : a feeling of anxiety or dismay, typically at something unexpected.

Synonym of Consternation is Surprise