Can we draw the following hypothesis from the context (see options)? 

Context:

Around 130 flights were cancelled during a strike held on 19 January, and others were cancelled in the days that followed. When the flight assistants announced a further 24-hour for 23 January, the Italian Guarantee Authority (Commissione di Garanzia) which regulates strikes in essential public services (under the terms of laws no. 194/1990 and no. 83/2000) (IT0004266F) accused the unions of breaching the legal provision that 10 days must elapse between one strike and the next.

Hypothesis: The schedule of the flights had to change
Options:
(A). Yes.
(B). It's impossible to say.
(C). No.
(A).