The correct order of name of four aldoses with configuration given below respectively is: L-erythrose, L-threose, D-erythrose, D-threose

If -OH group is on the right-hand side to the last carbon with respect to the highest oxidised carbon at the top, it is called D-isomer and if it is on the left side, it is called L-isomer. So, the names of the compounds are D-erythrose, D-threose, L-erythrose, L-threose, respectively.