The number of letters skipped between adjacent letters in the series is in the order of $2, 5, 7, 10.$Which of the following series observes the rule given above?

Rule: Select one from among the four series of figures which follows this rule. The number of letters skipped between adjacent letters in the series is in the order of $1^2, 2^2, 3^2$.

Which of the following series observe the rule given above?