d
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.