Final answer:
Amazon aims to enhance account security by ensuring users' new passwords are substantially different from their existing ones through an updated password policy (option A).
Step-by-step explanation:
Amazon wishes to implement a password policy that ensures when a user sets a new password, it significantly differs from the current one. The policy aim is not to ascertain users' preferences or the effectiveness of current policies, nor to evaluate the strength or frequency of changes. Instead, the primary goal is to reduce the risk of compromised accounts by preventing users from using passwords that are too similar to their previous ones. In enforcing such policy, Amazon ensures that the new passwords are not mere variations of the existing ones, thereby enhancing security.
To enhance security further, measures such as two-factor authentication and user education on scam avoidance may also be encouraged alongside the enforcement of stronger password policies. The emphasis is on creating a robust security system that discourages easy guessing or automated attacks through the use of common password variations.
Hence, the answer is option A.