Would you please take a light on if the bold parts have been selected properly?
Meanwhile, could you please show me which one of the sentences is recognised as the best sentence naturally?
A. In advanced and industrial countries, under economic and constant circumstance as well as change in society and behavioural patterns, the young's tendency towards marriage has been significantly reduced.
B.In advanced and industrial countries, through economic and constant circumstance as well as change in society and behavioural patterns, the young's tendency towards marriage has been significantly reduced.
C. In advanced and industrial countries, under economic and constant circumstance as well as change in society and behavioural patterns, the young's interest in marriage has been significantly reduced.
Any comment would be greatly appreciated