Your answer would be A. Novembre 8 because it means November 8th and November is the 11th month and it's not b because that says August 11th and not c because that means August 11th again.
"al" would correctly complete the sentence because it correctly links the verb "vamos" to "parque"
-Let's go to the park at five in the afternoon.
Nada está dormido y nada y comer