The Silverman–Anderson (Downe’s) score is used for:

Correct option is B

Silverman–Anderson (Downe’s) score is used to grade severity of respiratory distress in newborns, based on chest retraction, nasal flaring, and grunting.
Explanation of options: (a) ✘ Neonatal sepsis is diagnosed clinically and by lab, not by this score. (b) ✔ Correct; it quantifies neonatal respiratory distress severity. (c) ✘ Prematurity is assessed by New Ballard score, not Silverman–Anderson. (d) ✘ Birth asphyxia severity is assessed by Apgar score, not this one.