The writer adopts a (n) ______ tone to report the findings of the research in the sound structure of first names.

A．the bacteria are only effective against three species of beetles
B．Fields' technique is less effective in winter
C．Fields' technique may kill nearly all the beetles at -10℃
D．Insects may develop resistance against the bacteria

A．female
B．womanly
C．feminine
D．womanish