(A)
(B)
(C)
(D)
I.
II.
III.
(A)
(B)
(C)
(D)
I only
II only
III only
I and III
The first woman officially timed in a marathon was Violet Piercey of
Great Britain in 1926. Her record of 3:40:22 stood until 1963, mostly
because of a lack of women competitors. Soon after, times began
dropping rapidly, but lately they have been declining at a much slower
rate. Let M(t) be the curve that best represents winning marathon times in
year t. Which of the following is (are) positive for t > 1963?
M(t)
M′(t)
M′′(t)
I only
I and II only
I and III only
I, II, and III
