Suggestion for a sentence

[Alexzive]

Which of the following sentences sounds better (and correct) to you? many thanks, Alex

a) It is common, there is some conflict of interest among the employees

b)It is common THAT there is some conflict of interest among the employees

c)It is common TO HAVE some conflict of interest among the employees

d)It is common TO ENCOUNTER some conflict of interest among the employees.

[Mister Micawber]

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I only like C and D. B is structurally OK but very awkward: both a prop-it and a prop-there. A is a comma-splice error.
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Native English teacher at Mister Micawber's

[Alexzive]

thank you Mr. Micawber!