Which of the following describes the effect of mechanisation on traditional jobs?

The correct answer is found in the observation that mechanisation tends to significantly reduce job availability in traditional sectors. Mechanisation introduces technology that automates tasks that were previously performed by human workers, leading to a decreased need for manual labour. This shift can result in job losses as machines take over functions that used to require human input.

While traditional jobs might sometimes be replaced or redefined, the overall trend with the adoption of mechanisation is a reduction in the number of roles available for workers, especially in industries such as agriculture and manufacturing, where machines can often perform tasks more efficiently and at a lower cost. This transformation can lead to displacement for those who relied on such jobs for their livelihoods, and it often requires workers to seek new skills or adapt to entirely different roles in the workforce. Thus, the statement accurately captures the immediate consequence of mechanisation on traditional job markets.