A:Six billion, seven hundred and forty-three million, two hundred and thirty- four thousand, one hundred and twenty-three
B:Six billion and seven hundred and forty-three million and two hundred and thirty four thousand and one hundred twenty-three
C:Six billion and seven hundred and forty-three million and two hundred and thirty four thousand and a hundred and twenty-three
D:Six billions, seven hundreds and forty-three millions , two hundreds and thirty -four thousands a hundred and twenty-three;