Which isotope is the parent isotope in this nuclear equation? a. Superscript 245 subscript 95 upper C m right arrow superscript 241 upper P u plus superscript 4 subscript 2 upper H e. b. Superscript 241 subscript 94 upper P u.c. Superscript 4 subscript 2 upper H e. d. Superscript 245 subscript 96 upper C m.