Answer: A. Stark industries should acquire LENS
Step-by-step explanation:
Based on the information given in the question, the best strategy that Dev should suggest is that Stark industries should acquire LENS.
Since Stark Industries require the material from LENS and it's difficult to trade, the best option is to acquire it. The acquisition will make the production of the high-quality HD movie cameras easier.
It should be noted that entering into a competition with LENS is not advisable as that'll lead to the material not gotten. Also, a short or long term agreement isn't advisable as well.
Therefore, the correct option is A.