I think it’s E (microtubules) i can be wrong but hopefully this helped
        
             
        
        
        
Yes, phenotype of transformants: ampicillin-resistant colonies
 
        
             
        
        
        
Answer:
I think it is B. Market Penetration strategy. 
Explanation:
I'm very sorry if this is wrong but studying the two possible answer (A or B) 
B seemed the most probable due to the definition of the Market Penetration Strategy. Which is essentially "To focus on current products and current markets in order to increase market share". (I hope I was able to help! :)