Which of the following is a suit of civil nature?

Section 9 of the Code of Civil Procedure gives civil courts jurisdiction over all suits of a civil nature, that is, suits enforcing private legal rights, unless their cognizance is expressly or impliedly barred. A claim for accounts enforces such a right, so "Suits for accounts" are of a civil nature. Suits only to uphold dignity or honour and suits on political questions involve no legal right, and suits expressly barred cannot be entertained.