long and short of it

Options

A. hardly and suddenly
B. light and dark
C. the summary of the matter
D. day and night

Answer

C

Explanation

long and short of it: the sub stance or gist of something: explaining the general situation without giving details.
Look at the sentence:
• The long and short of it is that they are willing to start the work in January. The best option is the summary of the matter