Which of the following feature is false about Terai soil in Bihar?

Here is a brief explanation of each option:

• Option A: Neutral to acidic in reaction. Terai soil is typically neutral to acidic in reaction. This means that the pH of the soil is between 6 and 7.
• Option B: Grey to yellow in colour. Terai soil is typically grey to yellow in colour. This is due to the high concentration of organic matter in the soil.
• Option C: Lowland soil are more fertile than upland soil. Lowland soil in Terai is more fertile than upland soil due to the higher concentration of organic matter.
• Option D: High magnesium concentration. The concentration of magnesium in Terai soil is not high enough to be toxic to plants. Therefore, the statement “High magnesium concentration” is false.