This is called using context clues.
Another synonym for torrid is sweltering, because the definition for torrid is hot.
Answer:
A - After days and nights of incredible labour and fatigue, I succeeded in discovering the cause of generation of life; nay, more, I became myself capable of bestoing animation upon lifeless matter.
Explanation:
This line talks about the power of creating life - 'bestoing animaation upon lifeless matter' and that he has 'discovered the cause of generation of life'.
