Answer: (c) carbon
Buckminsterfullerene (C60) or buckyball is one of the allotropes of carbon. The structure of fullerene is like in a cage shape due to which it looks like a football.
Allotropes of carbon
Carbon with atomic number 6 and represented by the symbol ‘C’ in the periodic table is one of the most influential elements we see around us. Carbon is one of the elements which shows allotropy. The allotropes of carbon can be either amorphous or crystalline.
Diamond, Graphite, Lonsdaleite, C60 (Buckminsterfullerene or buckyball), C540, C70, Amorphous carbon, and a single-walled carbon nanotube, or buckytube are the allotropes of Carbon.