Option 1: 18 percent -> This is the standard GST rate applied to most goods and services.
Option 2: 15 percent -> This is not a GST rate slab.
Option 3: 13 percent -> This is not a GST rate slab.
Option 4: 11 percent -> This is not a GST rate slab.
Hence, Option 1: 18 percent -> The standard GST rate in India is 18%, which applies to the majority of goods and services. While GST has multiple slabs (0%, 5%, 12%, 18%, and 28%), 18% is considered the standard rate as it covers most common supplies across the country. -> correct