The adjective in positive degree should have been used after 'very', whereas 'wiser' is the adjective in comparative degree.
'Wise' will be the correct replacement.
The correct sentence is: Ashoka was not only a great warrior but also a very wise ruler.
Hence, option (a) is the answer.
Note: · The Positive Degree is used to denote the mere existence of some quality of what we speak about. It is used when no comparison is made.
· The Comparative degree denotes a higher degree of quality than the positive and is used when two things are compared.
· The Superlative degree indicates the highest degree of quality and is used when more than two things (or sets of things) are compared.
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