Assertion:. In Western countries, males outnumber females in rural areas and females outnumber the males in urban areas.
Reasoning: The excess of females in urban areas of U.S.A., Canada and Europe is the result of influx of females from rural areas to avail of the vast job opportunities.

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

In Western countries, males outnumber females in rural areas and females outnumber the males in urban areas. The excess of females in urban areas of U.S.A., Canada and Europe is the result of influx of females from rural areas to avail of the vast job opportunities. Farming in these developed countries is also highly mechanised and remains largely a male occupation.