The right option is; a. soil degradation
Soil degradation most plausibly accounts for the reduction in corn yield.
Soil degradation is an environmental problem in which the condition or quality of soil is reduced due to its improper use usually for agricultural or industrial purposes. Soil degradation can reduce the physical, chemical and biological quality of soil. Soil degradation results in loss of organic matter, soil contamination, fertility decline, and soil acidity or alkalinity which can greatly affect agricultural productivity.
The theory of plate tectonics states that that earth's crust is divided into plates that float on the semi-molten mantle below. Plates converge, diverge or slide past each other. Converging plates are responsible for the existence of fossil marine life in rocks on top of compressional mountains. Marine life gets deposited and buried in sediments in oceanic basins. As plates move together these layers of sedimentary rocks get folded and faulted upwards as the forces of compression become greater. Over time rocks are uplifted into impressive fold mountain ranges. This explains why fossil rocks are found on top of the Himalayas.
B) Grasses and Low shrubs
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People cut down the tropical rainforests and one of the main reason why they do it is so that they can have roads there instead.
C is correct.
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