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Left dominant circulation - posterior descending artery (PDA) which supplies AV node etc is coming from the *left circumflex. Prompt says it is blocked. To get to there, the correct anatomical pathway is Left coronary artery, circumflex artery, posterior interventricular (PDA).

This can be reasoned by process of elimination too. 1- Given the Left dominant circulation, we can eliminate pathways beginning at the right coronary. 2- To get blockage at posterior of heart, we will NOT use anterior interventricular artery, so you can eliminate the 2 options listing those. 3 - The circumflex artery gives rise to the PDA, but is not the final artery in our path to the blockage (so can eliminate another two). This should give you the correct answer.

Anterior (or sternocostal) – Right ventricle.

Posterior (or base) – Left atrium.

Inferior (or diaphragmatic) – Left and right ventricles.

Right pulmonary – Right atrium.

Left pulmonary – Left ventricle.

both left and right ventricles are on the diaphragmatic surface. AV node is also affected. PDA supplies posterior 2/3rd walls of both right and left ventricles and the AV nodes so we know that PDA is affected. now we need to figure out the order of cath passage. question states left dominant circulation. so itll be left coronary -> LCX -> PDA (aka posterior interventricular since PDA supplies post. 1/3 of interventricular septum)