(b) I, II and IV
India is a quasi-federal state because the Centre has more powers than States (I), residuary subjects vest with the Centre (II), and subjects like Currency and Railways are on the Union List under Central control (IV).
A quasi-federal state means the Centre is stronger than the States — a feature of India's "holding together" federation. Statement III is incorrect because India does not have equal subjects between Centre and States; the Union List has more and weightier subjects than the State List. Statements I, II, and IV all point to Central dominance, which defines India's quasi-federal character.