Which statement would not be a reasonable estimate?
- AAtmospheric pressure at sea level is about $1 \times 10^5\,\text{Pa}$.
- BLight takes $5 \times 10^2\,\text{s}$ to reach us from the Sun.
- CThe frequency of ultraviolet light is $3 \times 10^{12}\,\text{Hz}$.
- DThe lifespan of a man is about $2 \times 10^9\,\text{s}$.