Answer: None of the other answers are correct, because all of these variance combinations are possible.
Step-by-step explanation:
All of the above combinations are possible.
A company can have an Unfavorable labor rate variance and a favorable labor efficiency variance meaning that the actual labor rate was more than the budget rate but the budgeted labor Efficiency rate was more than the actual rate.
A company can also have an Unfavorable labor efficiency variance and a favorable material quantity variance meaning that even though labor Efficiency was not satisfactory, less materials were still used than were budgeted for.
There is also a possibility of a Favorable labor rate variance and unfavorable total labor variance and a Favorable labor efficiency variance and favorable material quantity variance can also happen together when actual direct labour and material quantity variance are both less than the budgeted amount.