Which of the following is an example of cause-related marketing?
a. Walmart makes a one-time charitable donation to the Ronald McDonald House.
b. Nationwide Insurance's sponsorship of NASCAR driver Dale Earnhardt Jr.
c. Aveda donates $4 for each specially-branded hand crème with pink cap to the Breast Cancer Research Foundation.
d. CVS Stores provide free bottled water to those affected by Hurricane Irma.