Step 1: Understanding regionalism.
Regionalism means giving undue importance to one’s own region over the nation. While love for one’s own region is natural, extreme regionalism may lead to harmful consequences.
Step 2: Analyzing the options.
(A) Fondness of own region: This is not necessarily bad; it may encourage cultural pride.
(B) Separatism: Correct — when regionalism turns extreme, it leads to separatist tendencies, which harm national unity.
(C) National interest: This is positive, not a bad result.
(D) National integrity: This too is positive and the opposite of separatism.
Step 3: Conclusion.
Thus, the bad result of regionalism is Separatism.