Select the option that best to explain the meaning of "grave concerns."
a
entailing great significance
b
having serious implications
c
demanding a tough conversation
d
implying genuine apprehensions

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

a. the man as a ruler