Final answer:
The sacraments of baptism, Eucharist, and confirmation are received only once in a person's lifetime. Conversion to another faith or into Catholicism does not require repeating these sacraments.
Step-by-step explanation:
The correct answer is (c) once; neglect.
According to Catholic beliefs, the sacraments of baptism, Eucharist, and confirmation are received only once in a person's lifetime. Baptism is the sacrament that purifies a person from original sin, and it is usually received shortly after birth, although it can also be received later in life. Eucharist is the sacrament where the bread and wine are believed to transform into the body and blood of Christ. Confirmation is a sacrament taken in young adulthood as a pledge to be a faithful member of the Church.
If a person converts to another faith or from another faith to Catholicism, it is not necessary to repeat these sacraments. The conversion to another faith or into Catholicism is seen as a change in belief rather than a need for re-baptism or re-confirmation.