What is the central idea of the article Elephants Attack as Humans Turn Up the Pressure? a) Scientists are developing new ways to prevent elephants from attacking humans and ruining their crops.

b) The number of elephant attacks against humans has been rising in both Asia and Africa.

c) Researchers think that stresses created by humans are the reason behind increasing numbers of elephant attacks.

d) Elephants react differently to pressures from humans than they do to competition from other elephants.