Which of the following is the smallest phase of cycle training

A microcycle is the shortest training cycle, typically lasting a week with the goal of facilitating a focused block of training. An example of this is an endurance block where a cyclist strings three or four long rides together within one week to progressively overload training volume.

blood alcohol concentration is affected by factors such as body size and gender.

( i saw this one before)

avoiding recreational drugs instead of using them