Question

inquizitive rhetorical situations, processes & genres (a comprehensive activity) handbook page w - 6c the following passage is taken from an argument by sarah dzubay. select the sentence that uses a transition to signal a contrast. this is called the \immunity threshold\ (willingham and helft). at this level, the general population is safe because those who have had their vaccinations are not only directly protecting themselves, but also indirectly aiding those who have not been vaccinated, because it is much more difficult for the disease to spread. however, when the levels of vaccination drop below this threshold level, diseases can come back with a vengeance, just as the measles have begun to. families choosing to opt out of the mmr and other vaccines are a threat to the protection that we have built against disease as a national and international community.

Explanation:

The word "However" is a transition word that signals a contrast. It separates the statement about safety at the immunity - threshold level from the statement about diseases coming back when vaccination levels drop.

Answer:

However, when the levels of vaccination drop below this threshold level, diseases can come back with a vengeance, just as the measles have begun to.