Thomasson Air uses two measures of activity, flights and passengers, in the cost formulas in its budgets and performance reports. The cost formula for plane operating costs is $36,330 per month plus $2,076 per flight plus $1 per passenger. The company expected its activity in April to be 93 flights and 243 passengers, but the actual activity was 92 flights and 248 passengers. The actual cost for plane operating costs in April was $226,310. The activity variance for plane operating costs in April would be closest to:

A: 3,331U

B: 2,071F

C: 2,071U

D: 3.331F