Assertion: The rural-urban migration stream is dominated by males.
Reasoning: In rural culture, women are not allowed to leave their houses and settle in a different city/state.

Assertion (A) is correct but Reasoning (R) is incorrect.

The correct answer i Option 3: Assertion (A) is correct but Reasoning (R) is incorrect.

Assertion: The rural-urban migration stream is dominated by males. This is correct because rural-to-urban migration in India is generally dominated by males, mainly due to employment and economic opportunities in urban areas.. 
Reasoning: In rural culture, women are not allowed to leave their houses and settle in a different city/state. This is false  because the statement is too absolute and generalized. Women are not universally prohibited from leaving their houses or settling in different cities/states. Female migration also takes place for marriage, education, employment, and family-related reasons. The spouses (female) are left behind in rural areas to look after children and elderly people

NCERT: " In developing countries, poor, semi-illiterate and unskilled labourers migrating from rural areas frequently end up performing menial jobs at low wages in the informal sector in urban areas. Since wages are very low to support the family at the place of destination, the spouses are left behind in rural areas to look after children and elderly people.  Thus, the rural-urban migration stream is dominated by males."