Which expression will equal a rational product even though it is multiplying an irrational number times another irrational number?

option A.       

Justification:

By definition the product of the square root of a number times itself is the same number.

This is:    

Because:   

Therefore, for the case given:  

And you have proved that the product of the two irrational numbers, √11, is a ratonal number, 11.

On the other hand, the other products, B, C, and D do not yield to a rational number. The result of the products shown on B, C, and D are irrational.