Answer:
The correct answer is - 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.