The number of statement(s) correct from the following for copper (at no. 29) is/are

(A) Cu (II) complexes are always paramagnetic
(B) Cu (I) complexes are generally colourless
(C) $\mathrm{Cu}\left(\mathrm{I}\right)$ is easily oxidized
(D) In Fehling solution, the active reagent has $\mathrm{Cu}\left(\mathrm{I}\right)$