The correct answer is B. Daffodils are as bright as stars at night.
Step-by-step explanation
The simile is a rhetorical figure through which the author of a text establishes a relationship between two elements that can be real or imaginary. According to the above, it can be inferred that the underlined sentence "Continue like the stars that shine and twinkle in the Milky Way" is a simile in which daffodils are related/compared with the stars of the Milky Way. Therefore, the correct answer is B. Daffodils are as bright as stars at night.