AIM GMAT wrote:

bubbliiiiiiii wrote:Guys OA is B.

But and I understand the parallellism maintained here.

what is bothering me is, how can we use two ands while representing the same list.

As per my understanding, and is used as an indicator that the next element in the list would be the last one. Considering this, how can a single list use two ands?

Please help me understand.

I would give you an analogy to understand . Consider it as a nested loop .

Some bat caves, like honeybee caves, have residents that take on different duties such as defending the entrance, acting as sentinels and sounding a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.