High flood level mark shall be painted in A. Red B. White C. Blue D. None of these

The correct answer is A. Red.

The high flood level mark is the highest level that water has reached in a particular area. It is important to know this level so that people can be prepared for flooding and take steps to protect their property. The high flood level mark is usually painted on a building or other structure, and it is often marked with a red line.

The other options are incorrect because they are not the colors that are typically used to mark the high flood level mark. White is often used to mark the low water level, and blue is often used to mark the mean high water level.