A. Low voltage winding: The low voltage winding, also known as the primary winding, typically has more turns than the high voltage winding. This is because the transformer relies on the principle of electromagnetic induction, which states that the voltage induced in a winding is proportional to the number of turns in that winding.

So, to step up the voltage, the transformer increases the number of turns in the primary winding, which in turn increases the voltage in the secondary winding.

B. High voltage winding: High voltage winding, also known as the secondary winding, typically has fewer turns than low voltage winding. The reason is as I mentioned above.

C. Primary winding: This is the same as A, the primary winding is the same as low voltage winding.

D. Secondary winding: This is the same as B, the secondary winding is the same as high voltage winding.

The correct answer is A. Low voltage winding.