Answer:
Definition 4.
Having qualities that discourage approach due to extreme difficulty.
Explanation:
From the four different definitions, the one that states the meaning of the word<em> "formidable" </em>is Definition 4 (See attached image).
The word <em>formidable </em>is used in the context of the sentence,
"To the tired track runner, the <em>formidable </em>last hurdle looked twice as large as it actually was"
Therefore, the meaning of the word according to the context is having qualities that discourage approach due to extreme difficulty because from the sentence, the tired track runner is looking at the last hurdle and seeing it as twice as large as it actually was.
<span>D. They have to predict which strains of flu will become active months before the flu season begins.
The text states, "</span>Creating a flu vaccine is a bit of a guessing game, because the shots take months to manufacture. Each year in February, the World Health Organization (WHO) tries to predict<span> what viruses may be circulating the following winter, a process that can change as bugs mutate. " This supports the answer that a challenge for vaccine makers is determining which strain of the flu must be targeted in order to prevent its spread. </span>
IM PRETTU SURE ITS B
I believe it would be several, a box around cute and tiny. The your answer should be B