@yoshifo That is not what it is saying. It is saying that we need to find the missing premise of "A -> B" to conclude that "A -> C"

So:

Bananas -> Fruits

WE NEED: Apples -> Bananas

TO CONCLUDE: Apples -> Fruits

This is the main difference they are trying to explain between MBT (Must Be True) questions and SA questions. Where we need to find the "WE NEED" portion in SA.