Which term best represents a feeling of compassion in writing?

The term that best represents a feeling of compassion in writing is "regrettably." This word often conveys an emotion that is aligned with empathy and understanding of a situation. When used in a context, "regrettably" can express sorrow or concern about an unfortunate outcome or circumstance that affects others, suggesting that the writer feels for those affected. This emotional resonance is integral in writing that aims to express compassion or sensitivity towards individuals or situations.

The other terms do not carry this compassionate undertone. "Therefore" implies a logical conclusion or result but lacks any emotional context. "Firstly" is simply a transitional phrase used to introduce a point in order, and "time" is a general concept that does not imply any emotional connection. None of these options convey empathy or concern in the way that "regrettably" does.