ANS:B - self lubricating qualities.

In the continuous casting process, graphite molds are used primarily with a view to providing self-lubricating qualities. Graphite is an excellent material for continuous casting molds because of its self-lubricating properties. As the molten metal flows through the graphite mold, the graphite acts as a lubricant, reducing friction between the mold and the solidifying metal. This self-lubricating behavior helps facilitate the smooth and continuous withdrawal of the solidified metal product from the mold without sticking or adhering to the mold surface. While graphite molds also possess other advantageous properties such as heat resistance and non-wetting surfaces, their primary advantage in continuous casting applications is their ability to provide effective self-lubrication, ensuring the smooth operation of the casting process.