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.
B is correct "A social commentator, who explains what a book says about people in general."
I wished my friend good morning, and he said let us go for a walk. Hopefully this helps.
I say its...
Traveling toward the west, the caravan made slow but steady progress.
Hope it helped :)
Alteration is repetition of consonants
