When we subtract two sets, say (A – B), the result will be a set obtained on removing those elements from A which also exist in B.

Note : We do not consider the elements of the subtracted set(here B) if it is not present in A.

So, we have (A – B) = {1, 2, 4} – {2, 4, 5}

= {1}

Similarly, we have (B - C) = {2, 4, 5} – {2, 5}

= {4}

[When we multiply two sets, each element of first set is paired with every element of other in an ordered pair of form (x, y)

where x belongs to first set and y to the other.]

Now, (A−B) × (B − C) = {1} × {4}

= {(1, 4)}

Since, it is a set so it is written in curly braces.

Therefore, option B is correct.