Please help

Jacob conjectured that fruit trees must be at least four years old to bear fruit. A counterexample to this statement is Select one: O a. Sky's four year old cherry tree has more fruit than her six year old cherry tree. O b. Melle knows of a sixty year old orange tree that still produces oranges. O c. Anna owns a one year old lemon tree. O d. Philip picked apples off a three year old tree