Answer:
The correct answer is - Â 1:1:1:1.
Explanation:
Mendel performed cross in between  peas with round, green seeds (RRyy) with peas having wrinkled, yellow seeds (rrYY)
             gametes : Ry and rY
                         ↓
      F1 :               RrYy
Test cross is the cross between f1 offspring and recessive parent which is
          gametes : RY, Ry, rY, ry and ry
                               ↓
                  F2 : RrYy, Rryy, rrYy, and rryy.
So, the phenotypic ratio of the offspring would be - 1:1:1:1.