Final answer:
Chaining involves using a data structure to store multiple pieces of data in the same index of the hash table.
Step-by-step explanation:
The type of collision-handling that involves using a data structure to store multiple pieces of data in the same index of the hash table is a) Chaining.
In chaining, each index of the hash table contains a linked list of elements. When a collision occurs, the element is added to the linked list at that index. This allows multiple pieces of data to be stored in the same index.
For example, if we have a hash table with index 0, and we need to store two pieces of data, we can add them to the linked list at index 0 in the hash table.