10. (Enem-MEC) Os quatro calendários apresentados abaixo mostram a variedade na contagem do tempo em diversas sociedades. Adaptado de: Época, n. 55, 7 jun. 1999. Com base nas informaçōes apresentadas, pode-se afirmar que: a) o final do milênio, 1999/2000, é um fator comum às diferentes culturas e tradições. b) embora o calendário cristão seja hoje adotado em âmbito internacional, cada cultura registra seus eventos mercantes em calendário próprio. c) o calendário cristão foi adotado universalmente porque, sendo solar, é mais preciso que os demais. d) a religiāo não foi determinante na definição dos calendários. e) o calendário cristāo tornou-se dominante por sua antiguidade.

## Step 1: Analyze the Gregorian Calendar
### The Gregorian calendar is based on the solar cycle and counts years from the birth of Christ. It is widely used internationally today.

## Step 2: Analyze the Islamic Calendar
### The Islamic calendar is lunar-based and starts counting years from the Hijra, the migration of Muhammad from Mecca in 622 C.E. This indicates that religious events significantly influence its structure.

## Step 3: Analyze the Jewish Calendar
### The Jewish calendar is also lunar and begins counting from the creation of the world according to the Bible, highlighting the role of religion in its formation.

## Step 4: Analyze the Chinese Calendar
### The Chinese calendar is lunar and starts its count in 2697 BC, attributed to the patriarch Huangdi. This shows a cultural and historical basis rather than a religious one.

## Step 5: Evaluate the Options
### - Option (a) suggests a common factor across cultures, which is incorrect as each calendar has different starting points and systems.
### - Option (b) states that while the Christian calendar is internationally adopted, each culture uses its own for significant events. This aligns with the descriptions provided.
### - Option (c) claims the universal adoption of the Christian calendar due to its precision, which is not supported by the information given.
### - Option (d) argues that religion was not a determinant in defining calendars, which contradicts the religious bases of the Islamic and Jewish calendars.
### - Option (e) suggests the dominance of the Christian calendar due to its antiquity, which is inaccurate since other calendars are older.