Answer:
i think is c,my ans will not be 100%correct
Answer:
Sorry for the late answer, but it should be A. Carbon's outermost shell can form up to 4 covalent bonds. It's one of the reasons why Carbon is considered an "essential element".
The initial report of the team formed by PURE may contain findings similar to the processes used in the disinfection of the water. Usual cases of ammonia presence in water are due to chloramine disinfection process. Also, they should also look into the storage of their facility and the end user which may also have a window of contamination.