Informal essays

a. can never be about serious topics
b. are usually about serious topics
c. can be about serious topics, if written in a serious style
d. can be about serious topics, but written in personal or informal style

D. can be about serious topics, but written in personal or informal style

Explanation:

The most common way is the storytelling formula, where you can talk about any topic, in a language for every kind of person.

The papers essays, are more serious and often uses APA rules for documents.

Best regards

for this case, we must find the number of deaths per day of the year 2015, in automobile accidents, knowing that 32,400 people died.

knowing that the year 2015 had 365 days we have the following division:

where "x" represents the number of deaths per day.

rounding off we have:

approximately, 89 people per day died in 2015

answer:

89 people per day