In What Sense Do We Say We Are Looking Back

In what sense do we say we are looking back in time when we are looking at the stars?

A) We see stars as they once were when their light reaches us.
B) Because space curves, we are actually looking at the past when we look in the night sky.
C) Because stars are emitting immense radiation, we are seeing processes that have already happened.
D) Because Earth's atmosphere bends and distorts their light.