Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution’.

Not only the manager give me a refund, but he also offered me a 50% discount on my next meal.

A

No substitution

B

Not only did the manager gave me a refund,

C

Not only did the manager give me a refund,

D

Not only do the manager give me a refund,