The correct option is C 21 days
Pursuant to the provisions of section 96, every company other than a One Person Company, whether public or private, incorporated under the provisions of the Companies Act, 2013 shall hold during every year a general meeting of members, which shall be called ‘Annual General Meeting’. It is mandatory on every company to hold an annual general meeting in every calendar year. For this purpose, giving not less than clear twenty-one days‘ notice either in writing or through electronic mode in such manner as may be prescribed