Let's understand the logical structure of the passage. Once you have read the entire passage, you will understand that two strategies are explained and compared.
First strategy is to make more complex products by investing in R&D, leaving the less complex products for competitors. This is based on the premise that the stock market favors companies which invest in R&D to make such products. Also, such products command high prices.
Second strategy is to make both simple and complex kind of products. This way the competitors are less likely to eventually catch up.
Notice that the second strategy is the main argument whereas the first strategy is the counterargument because second strategy is proposed to overcome the drawbacks of the first. That's how we know that the whole passage is to put forward the second strategy against the first.
Let's look at the options.
A - Role of the second is clearly incorrect.
B - Yes this fits our understanding. Let's keep.
C - Role of the second is again incorrect.
D - Second boldface is not the endorsed strategy. Incorrect.
E - Role of the second is again incorrect.
As you have observed, understanding the structure was very helpful here. The correct answer is option B.