Much work performed by small business owners, like managing human relations, keeping track of accounts, and paying taxes,which are essential to its successful operation, have gone virtually unnoticed by their employees.
(A) which are essential to its successfuloperation, have gone virtually unnoticed by their employees.(Work is singular)
(B) which are essential to successful operations,have gone virtually unnoticed by their employees.(Same as A)
(C) which is essential to its successful operation,
...
(A) which are essential to its successfuloperation, have gone virtually unnoticed by their employees.(Work is singular)
(B) which are essential to successful operations,have gone virtually unnoticed by their employees.(Same as A)
(C) which is essential to its successful operation,
...
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