The next letter would be S.
The correct answer is B) chemical to radiant. :)
Answer:
because you'll absorb more information. how? when reading a paperback book, you can annotate, which you cannot do with an online book. and for me personally, there's just something so magical about the smell of the glue and paper and the feeling and sound the pages make when you flip them.
good luck :)
i hope this helps
have a nice day!