Read the text and determine if the sentence is true (see options at the end):

On the morning of 1 June, there was a blackout throughout most of the capital caused by urban commandos of the Farabundo Marti National Liberation Front (FMLN).

Sentence: The blackout happened on the first day of the month
Choices:
[A]. Yes.
[B]. It's impossible to say.
[C]. No.
[A].