Need help balancing equations

How does a large body of water, such as the ocean, influence climate?

Ab c or d ? i’m not sure what the answer is

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water