1)
1/3 * 7 = 7/3 = 2 1/3
B is wrong
2) C - no
3) C - no
4) D - no
I give up! It seems that you need to learn how to multiply and divide fractions. Study these sites.
https://www.mathsisfun.com/fractions_multiplication.html
https://www.mathsisfun.com/fractions_division.html