I looked it up and it was “c. Silicon “
It could be that he doesn’t specify what kind of vitamins
Upwelling is a process in which the deep and cold water rises to the water surface and not sea surface. This process plays an important role in maintaining balance in our ecosystem as it boost the marine productivity by washing the nutrients from deeper waters to the photic layer where photosynthesis is promoted.
The one that contains thc is marijuana.