Which is the best way to prevent and reduce transmission?

Câu hỏi: Read the following passage and mark the letter A, B, C or D on the answer sheet to indicate the correct answer to each of the questions from 31 to 35.
Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus. Most people infected with the virus will experience mild to moderate respiratory illness and recover without requiring special treatment. However, some will become seriously ill and require medical attention. Older people and those with underlying medical conditions like cardiovascular disease, diabetes, chronic respiratory disease, or cancer are more likely to develop serious illness. Anyone can get sick with COVID-19 and become seriously ill or die at any age.
The best way to prevent and slow down transmission is to be well informed about the disease and how the virus spreads. Protect yourself and others from infection by staying at least 1 metre apart from others, wearing a properly fitted mask, and washing your hands or using an alcohol-based rub frequently. Get vaccinated when it's your turn and follow local guidance.
When people with infectious virus cough, sneeze, speak, sing or breathe, the virus can spread from their mouths or noses in small liquid particles. These range from larger respiratory droplets to smaller aerosols. It is important to practice respiratory etiquette, for example by coughing into a flexed elbow, and to stay home and self-isolate until you recover if you feel unwell.
Which is the best way to prevent and reduce transmission?
A. require medical attention
B. practice respiratory etiquette
C. be well informed about the virus
D. using an alcohol-based rub frequently