<span>Millions of Indians were killed due to illnesses and diseases of the Spanish.</span>
The best explanation why the area between Spain and Gaul was not part of the Roman empire until that later period was a culmination from both undesireability and difficulty in accessing this region due to its mountaineous nature. So I would wager the answer being both C and D - undesireability and difficulty in access.
Hey bud...
none of the continent is smaller than Europe and Australia.
They are listed last in the rankings of largest to smallest in land area.
hope it helps...!?!?!