Formal is like writing to professors. like this, The other day I was with a couple of friends at a cinema. After watching the film the Manager came towards us.... ect ect
I would think the answer is “C”, I don’t see a problem-solution or a cause & effect in the passage, and there is no chronological order of anything. So my answer would be “Fact by Fact”
He must have really enjoyed the visit to IFF plant in New Jersey. IFF might have attracted him because of their good discovery of flavors fragrances and cosmetic ingredients have inspired and delighted him to include so much detail.