Environmental barriers are external factors that hinder the smooth functioning of entrepreneurial activities.
Examples include non-availability of raw materials, shortage of machinery, and delay in financial resources.
These obstacles make it difficult for entrepreneurs to start or run their ventures efficiently.
However, availability of skilled labour is not a barrier — instead, it is a supportive factor.
When skilled labour is readily available, it helps entrepreneurs execute their plans successfully.
Therefore, only option (A) represents a positive condition, not a barrier.
So, the correct answer is Availability of skilled labour.