For a plane electromagnetic wave propagating in `` x `` -direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?
(A) `` \hat{j}+\hat{k}, \hat{j}+\hat{k} ``
(B) `` -\hat{j}+\hat{k},-\hat{j}-\hat{k} ``
(C) `` \hat{j}+\hat{k},-\hat{j}-\hat{k} ``
(D) `` -\hat{j}+\hat{k},-\hat{j}+\hat{k} ``