Further explanation

@mjenei, In the video explanation, Naz shows all of the original possibilities for this game 1) SSSS MMM 2) M SSS MM S 3) SS MMM SS 4) M SS MM SS 5) MM SS M SS 6) SSS MMM S 7) SSS MM S M Of these possibilities, the only ones where there aren't more than 2 loads of the same material being hauled consecutively are scenarios 4 and 5. Now we know for this question, we're only looking at the fourth and fifth scenarios. In this, we see that (B) could be true, as S is in 4 in the fifth scenario. All of the other answer choices never occur in either the fourth or fifth scenario, so they all cannot be true. Thus, (B) is the correct answer choice. Does this answer your question? Let us know if you have any other questions!

I am still confused what it means to say that no more than two loads are being hauled consecutively.

Would It be correct to say that we're looking at 4 and 5 because those are the only scenarios where you don't have more than 3 pairs combined, where the largest pairs in 4 and 5 are doubles instead of triples like the rest?

Why couldn't we have MSSMMSS? This would leave Mulch as 4th not stone, and it is still only being cleaned 3 times.

No more than two consecutively means we would not have three or more of the same sort in a row. Maddie's hypothetical is totally valid. But this is a could be true. So the fact that it is valid is irrelevant