The word "stared" in the sentence implies a prolonged and intense look. Among the options provided:

• "Gazed" (Option D) is the most appropriate choice, as it also signifies a prolonged and intense look.

The other options:

• "Glanced" suggests a brief or quick look.
• "Peeped" implies a quick and furtive look, often from a hidden or secretive position.
• "Looked" is a general term and may not convey the intensity of staring.
• "Fixed" might imply a steady or unwavering look, but it doesn't capture the sense of intensity conveyed by "stared."

Therefore, "gazed" best conveys the meaning of staring in this context.