The Main Contributing Factor to the Evolution of MDR-TB Is

The main contributing factor to the evolution of MDR-TB is ________.

A) the slow growth of Mycobacterium tuberculosis requires antibiotic therapy for months rather than days,which is hard to sustain in some populations; cutting the regimen short allows the resistant bacteria to flourish
B) the organisms that develop multidrug resistance have a different cell wall composition to the drug-susceptible organisms
C) certain species of Mycobacterium tuberculosis are able to undergo bacterial transformation at a faster rate than other species,resulting in the transfer of resistance genes
D) the abundance of antibiotics available in the United States and other developed countries makes it a particular problem for resistant strains to emerge in those parts of the world