Colegio, not sure what options there are but school seems it would fit best.
D. Explain to the reader why plastic bags are a necessary evil due to the inefficiency and high cost of other environmentally friendly solutions.
The text is promoting us to stop using plastic bags because they pollute the environment. These types of exercises are "<u>reading comprehension</u>".
<h3><em><u>MissSpanish</u></em></h3>
Yo voy a mi amigo Juan en la sala de clase.
