Insertion of an element at the middle of a linked list requires the modification of how many pointers?a.4b.3c.2d.1

The insertion of an element in the middle of a linked list requires the modification of 2 pointers.

Here's the step-by-step process:

1. Create a new node with the given value.
2. Traverse the linked list to find the position where the new node needs to be inserted. Keep track of the previous node.
3. Once the position is found, modify the 'next' pointer of the previous node to point to the new node.
4. Modify the 'next' pointer of the new node to point to the node that was originally next in the sequence.

So, the answer is c. 2.