This is one of the matters that disturb me the most.
Explanation:
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Is disturbed: This doesn't fit because the subject "one of the matters" is plural, so the correct verb form should be plural as well.
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Disturbs: This is the correct form. "Disturbs" is the present tense verb form that agrees with the plural subject "one of the matters."
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Are disturbing: This doesn't fit because "are" is used with plural subjects, and "one of the matters" is singular.
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Has disturb: This is not grammatically correct. The correct form is "has disturbed" if you were using a singular subject.
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