38. Which of the following groups of materials are examples of good conductors of electricity? (A) Rubber and fiberglass (B) Graphite and seawater (C) Rubber, graphite and fiberglass (D) Graphite, fiberglass and seawater

The correct answer is (B) Graphite and seawater.<br /><br />Explanation:<br />- Graphite is a form of carbon and is a good conductor of electricity due to its free electrons.<br />- Seawater contains dissolved salts, making it a good conductor of electricity.<br />- Rubber and fiberglass are insulators, meaning they do not conduct electricity well.