The answer is all of the above except choice 3.
In a business setting, you never want to use a detached tone. This gives the impression to your colleague/boss/etc. that you don't care and don't really want to be there. It shows that you don't see them as important and don't care about what they have to say. It won't achieve anything for you.
The gerund in this sentence is "learning". A gerund is a verb form which is acting as a noun, in this case after the preposition "in".
Answer: "He" is the person who succeeded despite the doubters.
The context seems to be a situation that seemed impossible to most people, but one person dared to try, even when someone scoffed and tried to discourage him.
The alliteration is the repetition of s-sounds in "someone scoffed"
Explanation:
