If a person depends only on a skill learned once what problem may occur in the long term?

Correct answer: Skill may become outdated according to changing demand

The direct answer is A: the skill may become outdated as demand changes. A skill learned once is not guaranteed to remain useful forever. Technology, tools, customer needs and workplace methods can change. Step by step, changing demand makes some old skills less valuable; if the worker does not practise or learn new methods, employability may fall; therefore, continuous learning is needed. Option A is correct because it describes this long-term risk. Option B is wrong because a skill does not always remain new without updating. Option C is wrong because income does not automatically rise; it depends on performance, demand and opportunities. Option D is wrong because competition does not end merely because someone has one skill. The useful idea is lifelong learning: keep learning, practise and adapt. Memory cue: changing work requires changing skills.