A．organic foods can be more expensive but are often no ……

The author implies that there is cause for concern if consumers with limited incomes buy organic foods instead of conventionally grown foods because ______.

A．organic foods can be more expensive but are often no better than conventionally grown foods
B．many organic foods are actually less nutritious than similar conventionally grown foods
C．conventionally grown foods are more readily available than organic foods
D．too many farmers will stop using conventional methods to grow food crops