M61-19

I think this is a high-quality question and the explanation isn't clear enough, please elaborate. can someone please explain the solution?

Since couples have to sit together you can think question as it asks for how many arrangements with 5 people is possible in a table at first. Since this is a round table (not a line) 5 people can sit chairs with 4! different arrangements. If it would be a line, number of arrangements would be 5! however, in a round table, every 4 of 5 different arrangements would be the same unlike a line (this is not very easy to understand). Shortly, 4! makes 24 and in the second step, since every element of our arrangements (I mean couples) has two members, they actually can change their places while sitting together. So, for every couple you should add (2) as multiplier to the number of arrangements which in total makes 4!x2^5.

I think this is a high-quality question and I agree with explanation.