Water pollution often occurs in central asia because of a political b. industrial c. agricultural d. technological reasons

B - Industrial problems

Water pollution in Central Asia is due to insuffient treatment and untreated sewage. They also have industrial accidents which contribute to the water pollution.

your list doesn't mention any of them at all.

and what does "these" mean anyway ?

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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