Four pairs of terms are given as: (i) \[{{a}^{2}}\]and 3ab (ii) 3yz and 6zy (iii) \[{{b}^{2}}\]and\[-11{{b}^{2}}\] (iv) \[{{a}^{2}}b\]and \[3a{{b}^{2}}\] Which two given pairs are pairs of unlike terms?

• A.  (ii) and (iii)
• B.  (ii) and (iv)
• C.  (i) and (iii)
• D.  (i) and (iv)