While
Sylvia in "A White Heron" wants the man's $10 for showing him the
location of the bird, she cares more for nature than for people or
profit. However, the man's entry into Sylvia's life comes at a time
when she is on the verge of puberty, and she has never had feelings of
attraction before. In his friendliness toward her, he is manipulating
the young girl's naivete to get what he wants: a rare bird to kill and
display on his wall.
The answer is D because she is increasingly attracted to the man, but
she doesn't follow her physical attraction; instead, she follows her
philosophical leanings.
"A White Heron" is an example of literary naturalism, in which the plot always lets nature win.