Final answer:
Professional cremations do not reduce bone to complete ash; bones are left brittle and are processed into a powder known as 'ashes'.
Step-by-step explanation:
In response to the statement 'In professional cremations, bone will be completely reduced to ash,' the accurate answer is B. False. During a professional cremation process, what primarily occurs is the exposure of the body to high temperatures, which leads to the incineration of organic materials such as tissue and organs. However, bones typically do not burn completely; they are left in a more brittle state known as cremated remains or 'cremains'. These remains are then processed into a fine powder by a machine called a cremulator, resulting in what is commonly referred to as 'ashes'.