Daniel is testing the impact of different soil pH levels on cucumber plant growth. He uses acidic, neutral, and alkaline soils and measures the height of the plants after 6 weeks. What are the independent and dependent variables in Daniel's experiment?

• A. Independent Variable: Type of cucumber seeds; Dependent Variable: Soil pH level
• B. Independent Variable: Height of the cucumber plants; Dependent Variable: Rate of photosynthesis
• C. Independent Variable: Soil pH level; Dependent Variable: Height of the cucumber plants
• D. Independent Variable: Amount of sunlight; Dependent Variable: Height of the cucumber plants

Answer: (C)