Option A is TRUE. Ie."When the subject of a sentence is singular, add –s to the base form. " For example 'run' or 'to run' this becomes runs for a sungular subject such as 'The boy runs away quickly when he sees the bear'
I dont know why she wants jig to stop talking but I imagine she says it over and over again to show that she is aggrivated and to make her point to show that she wants him to stop talking.