Answer: (Detailed Solution Below)
Option A: 23.5°
Detailed Solution:
The correct answer is “23.5°”.
The Tropic of Cancer is located at 23.5° North latitude.
At the winter solstice, the Sun is directly overhead at the Tropic of Capricorn (23.5° South latitude).
Therefore, the noon altitude of the Sun at the Tropic of Cancer would be 23.5° less than its maximum altitude (which occurs at the summer solstice).
So, 23.5° - 23.5° = 0°. However, since we're considering the altitude above the horizon, it would be 23.5°.