Question

Testing for Concussions

Answer 1

Answer:

A: A new blood test makes it easier-and safer-to detect concussions.

Explanation:

The main idea of the passage is A new blood test makes it easier—and safer—to detect concussions.

Notice the phrases question the use of and proposed an alternative way. They suggest that the main idea involves a possible solution to a problem. Here, the main idea is that the problem of detecting concussions without radiation could be solved by a simple blood test.