Officials in Gladewater are working to figure out the cause behind elevated levels of lead in the city's drinking water. On Monday, the city sent out a notice advising residents that water tested from June to September had higher than usual levels of lead. Levels that were not a violation under fed

Choose your answer: based on the paragraph above can we conclude that "The cause of the lead in the drinking water is unknown."?

pick from the following.
A). Yes;
B). It's impossible to say;
C). No;
I think the answer is