Reading Comprehension (RC) | One key to predicting a competitor's strategies

reading the passage we see that the main topic is to predict competitors stratergy. there is also an example showing how two companies reacted differently. para 3 tells us the ways to predict. we can easily eliminate a,c and e. now option d states that the primary purpose is to analyse business stratergy used by companies , this is a generalised statement ie it doesn't points to the whole passage which is specifically about
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