Answer :
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Among the tasks listed, the most difficult task facing a marketing manager would likely be "Changing existing negative attitudes." Here's why:
1. **Challenging Task**: Changing negative attitudes towards a brand or product is particularly challenging because it involves overcoming preconceived notions, biases, or past experiences that have led to unfavorable opinions. It requires a significant amount of effort and resources to shift these perceptions positively.
2. **Resistance to Change**: People tend to be resistant to changing their negative attitudes. Convincing individuals to rethink their views and beliefs can be an uphill battle for a marketing manager.
3. **Rebuilding Trust**: Negative attitudes are often accompanied by distrust or skepticism. To change these attitudes, a marketing manager must not only alter perceptions but also rebuild trust and credibility in the eyes of consumers.
While the other tasks mentioned are also important and require strategic planning, changing existing negative attitudes poses a unique set of challenges that demand creativity, persistence, and a deep understanding of consumer behavior.