[单选题]
The graph shows the number of femal.ba x *)7 sa(*d/-izzhoj hgkie African elephants (Loxodont an /my5(tzcd4a africana) born without tusks in Gorongosa 5d4 /m(azctny National Park. How does natural selection explain the trend shown in the graph?
A. Elephants broke their tusks while fighting, and their offspring were born without tusks.
B. Poachers hunted elephants with tusks, resulting in increased survival of elephants without tusks.
C. Elephants born without tusks are better fighters so survived better.
D. Mutations resulting in no tusk formation started to happen more often.
