Correct option is C
Reason I:
Migration happens due to availability of better career and economic prospects in cities.
Explanation: This reason directly relates to why people move from rural to urban areas. Cities often offer more job opportunities, higher wages, and better living standards, which are strong motivations for migration.
Conclusion: Reason I is a valid explanation for the statement.
Reason II:
Migration happens because people like travelling and exploring new cities.
Explanation: While some people may enjoy traveling and exploring new places, this is not a significant factor in permanent migration. Migration typically involves moving for better living conditions, job opportunities, education, etc., rather than just exploring new cities.
Conclusion: Reason II is not a valid explanation for the statement.
Final Decision:
Reason I correctly explains the migration observed in the statement.
Reason II does not provide a strong or relevant explanation.
Only statement I is a possible reason.