|Question 5Verbal

Source Texts

Text
The Caves of Gargas paintings--stencils of human hands found in what is now France and dating from around 27000 years ago--are thought of as art today, but the question of whether the people of the time understood the paintings as something akin to art in our modern sense or in some other way entirely is _____; we will never be able to answer it.
Which choice completes the text with the most logical and precise word or phrase?
irresolvable
A
self-contradictory
B
imperative
C
unavoidable
D