Final answer:
Scientific investigation can be used to find the answer to the question 'How fast does an Australian terrier grow?'
Step-by-step explanation:
The question that could be answered through scientific investigation is B. How fast does an Australian terrier grow? This question can be answered by conducting a study where Australian terriers of different ages are observed and measured over time. By collecting data on their growth rates and analyzing the results, scientists can determine the average growth rate of Australian terriers and provide an answer to this question.