The answer among the four choices is the third one, choice letter C.
When Louis Pasteur, a man who started out as a research chemist, let<span> nerve tissue from sick animals stand for a few days, the nerve tissue became weak.</span>
The aspect of Hobart Frost poetry that breaks from his tradition is his structure
Answer: clause
Explanation: there is no subject in the sentence
That he can no longer see them and he misses them