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Answer :
(c) Generally, metals are ductile.
EXPLANATION :
Ductility is the property of a solid material in which the material is drawn into wire under the tensile strain by stretching without breaking.
1) Option(a) All metals are ductile
This option is not true because all metals doesn't show the property of ductility. There is an exception for this statement. Mercury is a metal which exist in liquid state at the room temperature and thus cannot be drawn into wires.
2) Option(b) All non-metals are ductile
This option is not true because non-metals doesn't show the property of ductility. They are brittle in nature and thus upon stretching, they come under tensile strain and hence they break.
3) Option(d) Some non-metals are ductile
This option is not true because non-metals doesn't show the property of ductility.