Option (1) is correct: Section 370 of the IPC provides whoever imports, exports, removes, buys, sells or disposes of any person as a slave, or accepts, receives or detains against his will any person as a slave, shall liable to be punished.
Option (2) is incorrect: Section 373 talks about buying minor for purposes of prostitution, etc.
Option (3) is incorrect: Section 372 talks about selling minor for purposes of prostitution, etc.
Option (4) is incorrect: Section 374 deals with unlawful compulsory labour.