Mark the letter A, B, C, or D to indicate the correct answer to each of the following sentences.

Burning yard waste releases mold spores, soot, and other contaminants that can aggravate allergies and cause ____ problems.

Modern day agriculture practices ____ chemical products like pesticides and fertilizers to deal with local pests.

Land pollution can have huge environmental impact ____ the form of air pollution and soil pollution which in turn can have adverse effect on human health.

Waste from industrial and agricultural ____ pollutes the water that is used by humans, animals and plants.

The ozone layer is an invisible layer of protection around the planet that protects us ____ the sun's harmful rays.

The number of inhabitants on the planet ____ arriving at unsustainable levels as it confronts deficiency of assets like water, fuel and food.

Consumption of fossil fuels at an alarming rate can ____ to global warming which can further result in melting of polar ice caps and increase in sea levels.

Deforestation simply means clearing of the green cover and making that land available ____ residential, industrial or commercial purpose.