Select the option that can be used as a one-word substitute for the given group of words.
One who looks at the dark side of life

Correct option is C

The one-word substitute for "One who looks at the dark side of life" is "Pessimist."
· Meanings of the given words:
· Pessimist: A person who tends to see the worst aspect of things or believes that the worst will happen.
· Physicist: A scientist who specializes in the field of physics.
· Optimist: A person who tends to be hopeful and confident about the future or the success of something.
· Idealist: A person who is guided more by ideals than by practical considerations.