Which is a highly contagious bacterial infection of the lungs? tuberculosis streptococcus meningitis emphysema?

The correct answer is tuberculosis.

Tuberculosis is a highly infectious disease usually caused by the bacterium Mycobacterium tuberculosis which usually affects the lungs (can also affect other parts of the body). Tuberculosis is easy to spread through the air when people who have it cough, spit or sneeze. Latent tuberculosis is without symptoms, while active includes symptoms like cough with blood-containing sputum, fever, night sweats and even the weight loss.

i think the answer is b.