The correct answer is option 2: 12. The zodiac is a circle of twelve divisions, each named after a specific constellation. These constellations are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. Each zodiac sign is associated with certain personality traits and characteristics. They are also used to represent specific periods in astrology and horoscopes. Option 1, 10, is incorrect as there are not 10 zodiac signs. Option 3, 13, is incorrect as there are only 12 zodiac signs, not 13. Option 4, 11, is also incorrect as there are 12, not 11 zodiac signs. Therefore, option 2, 12, is the correct answer.