Scenario 13-11 Walter Builds Birdhouses. He Spends $5 on the Materials for Materials

Multiple Choice

Scenario 13-11
Walter builds birdhouses. He spends $5 on the materials for each birdhouse. He can build one in 30 minutes. He is semi-retired but earns $8 per hour at the local hardware store. He can sell a birdhouse for $20 each.
-Refer to Scenario 13-11. The implicit cost for one birdhouse is

A) $4.
B) $5.
C) $8.
D) $9.