The correct answer is: Only conclusion II follows.
The statement does not provide any evidence to support the conclusion that migration to big cities should be checked. It is possible that there are other factors that contribute to the increase in the number of child migrants, such as poverty or lack of opportunities in rural areas.
However, the statement does provide evidence to support the conclusion that the plight of poor children should be thoroughly studied. The statement indicates that child migrants are often forced to work in dangerous and exploitative conditions. It is important to understand the causes of child migration and the challenges that these children face in order to develop effective policies to help them.
Here is a brief explanation of each option:
- Option A: Only conclusion I follows. This option is incorrect because the statement does not provide any evidence to support the conclusion that migration to big cities should be checked.
- Option B: Only conclusion II follows. This option is correct because the statement does provide evidence to support the conclusion that the plight of poor children should be thoroughly studied.
- Option C: Either I or II follows. This option is incorrect because the statement does not provide enough evidence to support either conclusion.
- Option D: Neither I nor II follows. This option is incorrect because the statement does provide evidence to support conclusion II.
- Option E: Both I and II follow. This option is incorrect because the statement does not provide enough evidence to support both conclusions.