Option (i) and (iv) are the answers.
Representative elements are elements from the 5 and p-blocks. Transition elements belong to the f-block (Z=21–30; 39–48; 57 and 72–80; 89 and 104–112), while inner transition elements belong to the f-block (Z = 58–71 and Z = 90–103).
(a) Groups 3 and 1, 33 and 15, 53 and 17, and 87.
(d) Groups 9–17, 35–17, 51–15, and 88–2.