The correct option is D 28%
Goods and services tax is levied under five different tax slabs: 0%, 5%, 12%, 18%, and 28%, depending on whether they are services or goods of daily use or luxury. A washing machine comes under the luxury product catergory. So, it falls under the highest tax slab of 28%. Tax slabs of 0% and 5% are mostly imposed on essential commodities like rice, pulses, etc. However, 10% is not one of the five tax slabs of GST.