only question c i need to lear how to all 6axions

1. Which of the following sets are rings with respect to the usual operations of addition and multiplication? If the set is a ring, is it also a field? a. 7Z b. Z18 c. Q(V2) = {a + bv2 : a, be Q} d. Q(V2, v3) = {a + bv2 + cv3 + dv6 : a, b,c, de Q} e. Z[V3] = {a + bv3 : a, beZ} f. R = {a + bv3 : a, be Q} g. Z[i] = {a + bi : a, b E Z and i? = -1} h. Q(V3 ) = {a + by3 + cv9: a, b, c EQ}