Answer:
The hydropathy plot will be misleading when there is a stretch of hydrophobic amino acids like the ones seen in transmembrane helices due to the alpha helix that goes through the protein hydrophobic core.
 
        
             
        
        
        
Streptococcus pyrogenes : Round (or) Ovoid
Paenibaccilus polymyxa: 
Aquaspirillum bengal: Helical
Explanation:
- Streptococcus pyogenes are gram positive, Round shaped, Anaerobic growth bacteria, Non-motile bacteria.
- Aquaspirillum bengal is helical  in shape with  its composition of  deoxyribonucleic acid  and cytosine. It is Gram negative and chemo-organotrophic. It is also motile with the help of flagella.
- Paenibacillus polymyxa is also known as Bacillus polymyxa which is  capable of fixing nitrogen. It is found in soil, plant tissues and marine sediments. It has a major role in forest ecosystems and potential future applications as a biofertilizer and biocontrol agent in agriculture.
 
        
             
        
        
        
I think the answer might be B.