CREATE TABLE table_64709 ("Group" TEXT, "Name" TEXT, "Nationality" TEXT, "4.00" TEXT, "Result" TEXT)

Alana Boyd of group B with a 4.30 result has what nationality?
SELECT "Nationality" FROM table_64709 WHERE "Group" = 'b' AND "Result" = '4.30' AND "Name" = 'alana boyd'
SELECT "Nationality" FROM "table_64709" WHERE "Group" = 'b' AND "Name" = 'alana boyd' AND "Result" = '4.30'