One of the Most Significant Reasons for the Continued Stagnation

One of the most significant reasons for the continued stagnation of the British economy after World War I was:

A) That nearly half of its budget in the interwar period went to paying off debt from the war.
B) That workers demanded high wages in the aftermath of the war effort and businesses reacted too quickly to their demands by raising them.
C) The General Strike of 1926 dragged on for 10 months, causing the rise of Oswald Mosley's "Blackshirt" movement.
D) Full employment (i.e. a 4% unemployment rate) was reached in 1920, and businesses could not find an adequate work force to staff their businesses.