The right option is; d. casual dating, steady dating, engagement, marriage
The correct order of the continuum of dating and courtship is; casual dating, steady dating, engagement, marriage.
Dating/courtship is a period of development towards a romantic relationship whereby two people engage in social activities with the intention of ascertaining their suitability as a prospective partner in long term relationship or marriage. The continuum of dating and courtship is a continuous series of stages that has little differences. The continuum starts with casual dating which proceeds to steady dating, and then advances to engagement and eventually marriage. There is increase in the level of commitment as the relationship progresses from one stage to another.