Final answer:
A. Significant improvements in storage technology and an increase in the volume of business data have made big data analytics accessible to nearly all types of organizations.
Step-by-step explanation:
Significant improvements in storage technology has made big data analytics accessible to nearly all types of organizations. With the advancements in storage technology, organizations are now able to store and manage large volumes of data efficiently and cost-effectively. This allows them to collect and analyze data from various sources to gain valuable insights and make data-driven decisions.
Additionally, the increase in the volume of business data has contributed to the accessibility of big data analytics. As more and more data is generated by organizations due to advancements in technology and increased digitization of processes, the need for tools and techniques to analyze and extract value from this data has grown.
On the other hand, the factors mentioned in options b and c, i.e. flat file organization of data and significant increase in costs, do not directly contribute to the accessibility of big data analytics.