Final answer:
The answer is (a) One, as the Roman Catholic Church was the primary form of Christianity in Western Europe until the Protestant Reformation in the 16th century.
Step-by-step explanation:
During the time period in question, there was essentially one dominant form of Christianity in Western Europe, which was the Roman Catholic Church. The other branches, such as Protestantism, with denominations like Lutheranism and Methodism, only emerged later with the Protestant Reformation, which began in the 16th century, notably in Northern Europe. Christian humanism, which was another intellectual movement within Christianity, primarily developed in Northern Europe rather than in the British Isles, Southern Europe, or Eastern Europe.
As for the variations of sacred scriptures, each religious tradition, including Christianity, went through a process of determining their Canon or official version of the sacred texts, much like the determination of heresy and orthodoxy among early Christians. The two early branches of Christianity were the Catholic and Orthodox Churches, and these were further diversified with the advent of Protestantism and its various denominations, including Presbyterians, Methodists, and Seventh-day Adventists.
So, the answer to the question would be (a) One, since during the early period and up until the Reformation, the Roman Catholic Church was the primary form of Christianity in Western Europe.