Select the option that represents the letters that, when sequentially placed from left to right in the blanks below, will complete the letter series.
t u _ _ x _ _ _ u u_ _ x y _ _ _ v x x _
1
u v x y u v x t u u y
2
u v x x t v x t u u y
3
u v x y t v x t u u y
4
u v x y t v x t u u u