What is the purpose of the itertools.chain() function?

The correct answer is Option B: To merge multiple iterators into one.
The purpose of the itertools.chain() function is to merge multiple iterators into one single iterator. When called with multiple iterable arguments, chain() returns an iterator that yields values from each iterable consecutively, effectively chaining them together into a single sequence. This is useful when you need to iterate over multiple sequences as if they were one continuous sequence, without creating a new combined data structure like a list.