The correct option is A 6529Cu and 5524Cr
Isodiaphers are species that have different atomic and mass numbers, but have the same number of neutrons in excess i.e.the difference between the number of protons and the number of neutrons in the nucleus is same.
Option No.ElementsNumber of neutronsNumber of protonsDifference between number of protons and neutrons(a)6529Cu65−29=362975524Cr55−24=31247(b)6529Cu65−29=362975224Cr52−24=28244(c)23892U238−92=146925423190Th231−90=1419051(d)23592U235−92=143925123290Th232−90=1429052