Answer:
A. $37,400 unfavorable
Step-by-step explanation:
With regards to the above, variable overhead spending variance is computed as
= (Actual hours × Actual rate) - (Actual hours × standard rate)
= $649,400 - ( 34,000 × $18)
= $649,400 - $612,000
= $37,400 unfavorable
Therefore, Warp's variable overhead spending variance for the month of September is $37,400 unfavorable