Verified Answer :

your answer is c) lead.  because a leaded stained glass was used with lead glass which holded the pieces together.

In order to join stained glass pieces together lead is used

The lead is preferred material as

a) due to its soft and flexible nature we can easily cut and mold it according to the application area

b) Compared to other options lead is less costly and is long lasting

Thus lead finds its application in came glass work

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