(A) The densities of the alkaline earth metals are as follows:$Be: 1.84 \ g \ cm^{-3}$$Mg: 1.74 \ g \ cm^{-3}$$Ca: 1.55 \ g \ cm^{-3}$$Sr: 2.63 \ g \

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(A) The densities of the alkaline earth metals are as follows:$Be: 1.84 \ g \ cm^{-3}$$Mg: 1.74 \ g \ cm^{-3}$$Ca: 1.55 \ g \ cm^{-3}$$Sr: 2.63 \ g \ cm^{-3}$Comparing these values,the order of density is $Sr (2.63) > Be (1.84) > Mg (1.74) > Ca (1.55)$.Therefore,the correct order is $Sr > Be > Mg > Ca$.