Sometimes when i have my morning coffee, which i drink black with no cream or sugar, i notice a thin film floating on top of the coffee. since i have just read chapter 3 of the text, i now realize the nature of this substance and so i run to my friend screaming, "look at this in my coffee! "

Hydrophobic Substance.

Explanation:

On drinking the coffee with no cream or sugar a thin layer floating on top of the coffee.This substance that float atop of the coffee is called the hydrophobic substance.

Hydrophobic substances are those substances that are water repellent.They are mostly oils,fats,alkenes. Dry Coffee contains some oils hence this layer appeared on the top of the coffee.

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the correct answer is :

{b.}   ( american workers lose job opportunities )

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    -sprinkles