Witch standby BEST explains who earns the most money

a:dreya earns the most money per item sold b/c her line increases at a faster rate the marsha

b:marsha earns the most money per item sold b/c her line increases at a faster rate then dreyas

c: dreya earns the most money per item sold b/c her line begins at a higher point the marshas

d: marsha earns the most money per item sold b/c her line begins at a higher point the dreyas