Why would Alesandra need less life insurance if Luis passes away prematurely compared if she passes away prematurely first?

Why would Alesandra need less life insurance if Luis passes away prematurely compared if she passes away prematurely first? Alesandra has higher income, and therefore a higher Social Security benefits Alesandra has higher income, and therefore a lower Social Security benefit: Luis has higher income, therefore Alesandra will need less insurance Luis has higher income, and lower life insurance death benefit amount