Which Statement About the Stages of Starbirth Is FALSE

Multiple Choice

Which statement about the stages of starbirth is FALSE?

A) At stage 1, only the cloud exists.
B) By stage 3, the star has formed a photosphere.
C) Nuclear reactions begin in the core by stage 4.
D) The T Tauri wind is prevalent in stage 5.
E) By stage 7, the star has reached the main sequence.