Final answer:
The minimal requirement for the validity of any sacrament of Baptism in the Catholic Church is the Trinitarian Formula, which reflects the belief in the Holy Trinity.
Step-by-step explanation:
In the Catholic Church, the minimal requirement for the validity of any sacrament of Baptism requires the Trinitarian
Formula, which is the recitation of prayers invoking the Holy Trinity (Father, Son, and Holy Spirit). This formula is essential because it reflects the belief in the fundamental doctrine of the Holy Trinity in Catholic theology.
The other options listed (b) Oil of Chrism and (c) Immersion in water, while important elements in the sacrament of Baptism, are not minimal requirements for its validity.