Thato runs a manufacturing business. In his manufacturing account for the year ended $31$ December, the amount of work in progress had risen. What effect did this have on the cost of production and the cost of sales?
- Acost of production decreased; cost of sales decreased
- Bcost of production decreased; cost of sales no effect
- Ccost of production increased; cost of sales increased
- Dcost of production increased; cost of sales no effect