The factor that is forcing many South Asians to move to cities is

a. religious conflict in rural areas.

b. the threat of landslides in coastal areas.

c. lack of arable land due to a growing population.

d. dry conditions in the Indo-Gangetic Plain

C?

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Yes, option C is correct. The factor that is forcing many South Asians to move to cities is the lack of arable land due to a growing population.

To arrive at this answer, let's analyze the options:

a. Religious conflict in rural areas is not the primary factor driving South Asians to move to cities. While religious conflict may be a contributing factor in some cases, it is not the main driver in the region as a whole.

b. The threat of landslides in coastal areas may be a concern in some specific areas but it does not affect the majority of South Asians. Therefore, it is not the main factor driving migration to cities.

c. Option C states that the lack of arable land due to a growing population is forcing South Asians to move to cities. This option is accurate because the increase in population reduces the availability of land for agriculture, leading to urban migration.

d. Dry conditions in the Indo-Gangetic Plain may have an impact on agricultural productivity, but it is not the main force driving people to move to cities. Other factors such as lack of arable land due to population growth have a stronger influence.

So, the correct answer is indeed option C: lack of arable land due to a growing population.