I’m pretty sure it would be C. Chaos
I would say c. timelessness of the message.
Why? Because:
a) your piece of writing has to have a message - if there is no message, there is no point in writing it.
b) you have to have an intended audience you are writing for - it is not the same writing something for your friends, little brother/sister, professor or a potential employer.
c) the format of the message is important because of the previous factor and because the format usually affects the reception of the writing; nobody will be interested in your text if you write it without commas, fullstops, capitalized letters at the beginning of the sentence, or for example, without spaces between the words because it would be too confusing.
While, the timelessness is not as important. You are writing it for a special purpose now, and if it is good it might become timeless. But there are probably many great works (poems, scientific papers, novels, etc.) that were lost or forgotten, but that does not mean they were not great or significant.
Hope my answer is not too confusing :)
D. It should not astonish or amaze
The best transition to add at the beginning of the third sentence is the following:
C. In addition.
Considering that the sentence introduces information that follows and agrees with the previous sentence, ‘in addition’ is the best transition as it specifies that the sentence will add more reasons for volunteering.
