Consider the Following Graph

Multiple Choice

Consider the following graph.The data for the graph was obtained at constant temperature. Which of the following correctly describes the relationship shown on the graph?
i.V ∝ P
ii.V ∝ 1/P
iii.V = kP
iv.V = k(1/P)

A) iv only
B) i and ii
C) iii and iv
D) i and iii
E) ii and iv