The correct answer is B

Let us do the first product,
We have;

We can re-group the sign and the numbers to obtain;

But we know that; negative times negative is positive. So the product becomes,

Similarly for the second product,
We have;

We can again re-group the sign and the numbers to obtain;

But we know that; negative times negative is positive. So the product becomes,

Putting all together gives,

Finally, positive times positive will also give positive. That is,
