Which initiative was launched by the government between 1987 and 1991 that involved campaigns for development?

The correct option is New Democratic Initiative.

Between 1987 and 1991, the government of Kerala in India launched the "New Democratic Initiative" (often associated with the People's Plan Campaign or decentralization initiatives). This initiative involved intense campaigns for local-level development, mobilizing science, literacy, and voluntary resource mapping to involve people directly in development planning.

Let us look at why the other options are incorrect:
• Development Outcome Programme: This is not a specific historical initiative launched during the 1987–1991 period with mass campaigns.
• Kamraj Plan: This plan was proposed by K. Kamaraj in 1963, under which senior Congress leaders resigned from ministerial posts to work for the party organization.
• Socialist pattern of society: This was a broad social and economic goal adopted by the Indian Parliament and the Congress party in the mid-1950s (specifically at the Avadi session in 1955), rather than a specific campaign-based initiative from the 1987–1991 period.