Which of the Following Variances Cannot Occur Together During the Same

Which of the following variances cannot occur together during the same period?

A) Unfavourable direct-labour rate variance and favourable direct-labour efficiency variance.
B) Unfavourable direct-labour efficiency variance and favourable direct-material quantity variance.
C) Favourable direct-labour rate variance and unfavourable total direct-labour variance.
D) Favourable direct-labour efficiency variance and favourable material quantity variance.
E) Favourable direct-labour efficiency variance and an unfavourable fixed-overhead efficiency variance.