Choose the situation which would best be modeled by an exponential decay function.
a) an island is being eroded away and loses 10% of its beachfront every year.
b) a player's batting average decreases by .025 for each year he is in the major leagues.
c) a bank account has fallen below a minimum balance and is being charged $1.50 per day in fees.
eliminate
d) a machine depreciates (loses value) by $1000 in its first year, by $2000 in its second, $3000 in its third, etc.