Can’t view photo, clarification please
Answer: Symptoms of potassium deficiency appear on the lower portion of the plant first with chlorosis (yellowing) at the leaf margins followed by necrosis (death). Potassium deficiency can be caused by soil pH, extreme liming or calcium rich areas of fields, lack of soil oxygen or true soil deficiency.
D because the sun is an average sized star
B. photosynthesis uses light energy to convert carbon dioxide and water to glucose and oxygen