The mismatched combinations are
A. Chlorophyll $$-$$ Co
B. Water hardness $$-$$ EDTA
C. Photography $$-$$ [Ag(CN)$$_2$$]$$^-$$
D. Wilkinson catalyst $$-$$ [(Ph$$_3$$P)$$_3$$RhCl]
E. Chelating ligand $$-$$ D $$-$$ Penicillamine
Choose the correct answer from the options given below.

Checking the matches:

A. Chlorophyll — Co: INCORRECT. Chlorophyll contains Mg, not Co (Co is in vitamin B12).

B. Water hardness — EDTA: CORRECT. EDTA is used to determine water hardness.

C. Photography — [Ag(CN)₂]⁻: INCORRECT? Actually, in photography, [Ag(S₂O₃)₂]³⁻ is used (hypo/thiosulphate). However, [Ag(CN)₂]⁻ is used in silver extraction. So C is a mismatch.

D. Wilkinson catalyst — [(Ph₃P)₃RhCl]: CORRECT.

E. Chelating ligand — D-Penicillamine: CORRECT (D-Penicillamine is a chelating agent).

Mismatched: A and C only.

The correct answer is Option B: A and C only.