The correct answer is A (93.7). The percentage change in the bond's price is calculated using the formula:

$\%\Delta P = -\text{Modified Duration} \times \Delta Y + \frac{1}{2} \times \text{Convexity} \times (\Delta Y)^2$

Substituting the given values:

$\%\Delta P = -6.9 \times 0.0075 + \frac{1}{2} \times (-212) \times (0.0075)^2$

$\%\Delta P = -0.05175 - 0.0059625 = -0.0577125$

This results in a price decline of approximately 5.77%. The new bond price is:

$99.4 \times (1 - 0.0577125) = 93.6634$

Rounded to 93.7, which matches option A.

Option B (94.3) is incorrect because it uses par value (100) instead of the given bond price (99.4).

Option C (94.9) is incorrect because it incorrectly treats convexity as a positive value, leading to an inaccurate price adjustment.