There is a time aspect to the traffic flood and if you correlate the data analytics with the times that the incidents happened, you will be able to prove the theory.
Incorrect Answers:
B: A honey pot is designed to attract traffic and this will not prove the theory.
C: Configuring any of your servers for high availability will only accommodate the competitor and not prove your theory.
D: Logging all incoming traffic will not prove the theory as you want to check whether the incidents occur when the competitor makes major announcement a not all of the incoming traffic, even it if is from the competitor.
References:
Gregg, Michael, and Billy Haines, CASP CompTIA Advanced Security Practitioner Study Guide, John Wiley & Sons, Indianapolis, 2012, pp. 114-115

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RFI (request for information)
The first phase in the contract requirement process, in which a company sends out notices to prospective vendors or contractors asking them for their experience and qualification in filling the business's need for services or equipment.
RFP (request for proposal)
The second phase in the contract requirement process, in which a company asks prospective vendors or contractors for their proposed solutions to the business's needs.
RFQ (request for quote)
The third phase in the contract requirement process, in which a company negotiates the financial details of their relationship with prospective vendors or contractors.