Etilolation is caused by the influence of

Explanation

Etilolation is a process that happens to plants when they are grown in the dark or are not exposed to enough light. This results in the stems of the plants becoming elongated and weak. The question is asking what causes etiolation in plants and provides five options to choose from. Option A is oxygen, which is not correct. Plants need oxygen, but it has no direct impact on etiolation. Option B is water, which also does not cause etiolation. Water is essential for plants, but it does not lead to elongated and weak stems. Option C is mineral salts, which are important for plant growth, but they do not cause etiolation. Option D, light, is the correct answer to the question.