I can't understand this and the teacher wont help. can someone tell the the answer

Me translate these latin sentences! 24 points! 1. bella ab graecis in (against) romanis gerebantur. 2.puer ab nauta romanos pugnare gladio doctus erat. 3. magna cena ab regina fera paratur. 4. malae magae gladio magico caprum necare parabant.

Which sentence uses the verbs correctly?

What is the potential danger from an accident at a nuclear power plant? a) fire and large scale explosions b) exposure to radiation c) meltdown of the plant and surrounding community d) entire cities could be wiped out