Ridges are the structural features of fingerprints, not a specific pattern. The three primary fingerprint patterns are whorls, arches, and loops, which are used in forensic analysis for classification and identification.
Europium (Eu) resembles Calcium (Ca) in the following ways:
(A). Both are diamagnetic
(B). Insolubility of their sulphates and carbonates in water
(C). Solubility of these metals in liquid NH3
(D). Insolubility of their dichlorides in strong HCI
Choose the correct answer from the options given below: