Final answer:
The drill for the 2.9 SHORT pushlock is 1 mm shorter than the standard PushLock Drill according to the provided information, which suggests a slight shrinkage when pressure is applied.
Step-by-step explanation:
The drill for the 2.9 SHORT pushlock is 1 mm shorter than the standard PushLock Drill. This is based on the provided information which states that there is a 1 mm difference. This seems reasonable and aligns with the idea that an object might shrink slightly when pressure is applied.
The correct answer from the multiple choices given would be A. 10mm if we consider usual length increments, but based on the reference information, the precise answer is 1 mm, which is not listed among the options. Without additional context, we can only assume that the question might contain a typo or error as the provided reference indicates only a 1mm difference.