The correct option is A
Let us play!
Let us play!
In Nancy's code language, 2 1 12 12 stands for 'ball'. This means, she has assigned each letter in the English Alphabet to a unique number. For example, A stands for 1, B stands for 2, C stands for 3 and so on.
Nancy says, "12 5 20 21 19 16 12 1 25!" which decodes to "Let us play!"