Step: 1
Line of symmetry is a line that divides the figure into two parts, which are mirror images of each other.
Step: 2
In choice A, the lines through the letters G, L and R do not divide them into symmetrical parts.
Step: 3
In choice B, the line through the letter O divides it into symmetrical parts, but the lines through the letters Q and P do not divide them into symmetrical parts.
Step: 4
In choice C, the line through the letters X, V and I divide them into symmetrical parts.
Step: 5
In choice D, the lines through the letters T and D divide them into symmetrical parts, but the line through the letter S does not divide it into symmetrical parts.
Correct Answer is : Group 3