Assuming that two or more individuals die at the same time, and it is impossible to determine if the death of any of the comorients preceded the ot...

Assuming that two or more individuals die at the same time, and it is impossible to determine if the death of any of the comorients preceded the others, it will be presumed that the death of the oldest occurred first. (Wrong.)
Regarding the situation presented, there is no comorbidity, since such an institute only applies to cases of simultaneous death among relatives. (Wrong.)
What should be registered in the public registry? (Right.)

If two or more individuals die at the same time, and it is impossible to determine if the death of any of the comorients preceded the others, it will be presumed that the death of the oldest occurred first.
Comorbidity only applies to cases of simultaneous death among relatives.
Births, marriages, and deaths will be registered in the public registry.
The annulment or nullity of marriage, divorce, judicial separation, and the reestablishment of conjugal society will be registered in the public registry.
Judicial acts or extrajudicial acts that declare or recognize filiation will be registered in the public registry.
The emancipation by the parents' grant or by the judge's sentence will be registered in the public registry.
The declaratory sentence of absence and presumed death will be registered in the public registry.
a) 1, 2, 3, 4, 5, 6, 7
b) 2, 3, 4, 5, 6, 7
c) 1, 2, 3, 4, 5, 6
d) 1, 2, 3, 4, 5, 7
e) 2, 3, 4, 5, 6