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.
THe heart represent guilt because it was all in his head, and the clock represents death approaching, hope this helps.
Sixth is (b)
Seventh is probably (d)
Eighth is (c)
Ninth is (a)
Tenth is probably (b)