Which of the structures listed below develop(s) from the respiratory diverticulum (lung bud)?

Splanchnic Mesoderm surrounding the foregut, supporting structures of the tracheobronchial tree, including muscle and connective tissues, develop from the mesoderm that surrounds the developing lung bud. the respiratory bud (lung bud) that developed at the caudal end of the laryngotracheal diverticulum (week 4) divides into 2 lateral outpouchings --> called primary bronchial buds.  

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.