Detailed Answer
Answer (D) is correct. The standard hours allowed equaled 2,000, and the labor efficiency variance was $1,600 unfavorable; i.e., actual hours exceeded standard hours. The labor efficiency variance equals the standard rate ($8 per hour) times the excess hours. Given that the variance is $1,600, 200 excess hours ($1,600 ÷ $8) must have been worked. Thus, 2,200 actual hours (2,000 standard + 200 excess) were worked.