Discussion
Ballistics coefficients is directly proportional to :
Answer: A
The ballistic coefficient is directly proportional to the weight of the bullet.
\[ C = \frac{m}{i\,d^{2}} \]
Here m is the mass of the bullet, d its diameter and i its form factor. A heavier bullet of the same shape and calibre carries more momentum against air resistance, so it has a higher coefficient and keeps its velocity better.
The coefficient varies inversely with the form factor (a blunter bullet has a larger i) and inversely with the square of the diameter, so neither is directly proportional. 'Type of the bullet' is not a quantity in the formula.
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