Correct option is C
Ghettoisation often occurs due to various social, cultural, and economic reasons (A), compelling conditions such as fear or hostility (C), and for the community to feel more secure (D). While seeking better job opportunities and marital partners (B) can be a factor in migration or community formation, it is not typically a primary cause of ghettoisation, which is more often associated with social marginalization and the need for security among members of a particular community.