What is indicated by the term 'agape' when describing a person's expression?

The term 'agape' when describing a person's expression refers specifically to being open-mouthed, often as a reaction to surprise or astonishment. This expression can indicate a sense of being taken aback or overwhelmed by what one is observing or experiencing, evoking a vivid image of someone caught in the moment, wide-eyed and mouth slightly open, as they process an unexpected event or revelation.

The other choices, while they describe various states of emotion or demeanor, do not accurately capture the specific connotation of 'agape'. For instance, ecstatic and joyful expressions would not necessarily involve an open mouth, nor would a calm and collected demeanor, which suggests control and composure rather than surprise. Similarly, deeply contemplative implies a focus and thoughtfulness that is not represented by the surprised openness that 'agape' conveys. Therefore, the second choice clearly aligns with the essence of the term as it applies to a person's expression.