ACCorDing to thE pAssAgE, FloriDA orAngEs wErE vAluED By thE spAnish primArily ______.
A．As A mEDium oF ExChAngE
B．For thEir unusuAl sEEDs
C．For thEir mEDiCAl usE
D．As A sourCE oF FooD For sAilors