ANS:A - Tungsten

Tungsten has the highest melting point out of the following options: Zirconium, Molybdenum, and Tantalum. Melting point refers to the temperature at which a solid material transitions to its liquid state. Tungsten, also known as wolfram, possesses the highest melting point of any metal and is one of the elements with the highest melting points overall. The melting points of the elements listed are approximately as follows:

• Tungsten: around 3422 degrees Celsius (6192 degrees Fahrenheit)
• Zirconium: around 1855 degrees Celsius (3371 degrees Fahrenheit)
• Molybdenum: around 2623 degrees Celsius (4753 degrees Fahrenheit)
• Tantalum: around 3017 degrees Celsius (5463 degrees Fahrenheit)

Tungsten's exceptionally high melting point is attributed to its strong metallic bonds and the arrangement of its atoms in its crystal lattice structure. This property makes tungsten highly suitable for applications requiring materials that can withstand extremely high temperatures, such as in light bulb filaments, high-temperature furnace components, and aerospace applications.