Explanation

Creating a filter: the original sentence is a bit confusing. The phrase "after her passing," in particular, is not optimal. The sentence makes it sound like it took more than 12 years to build after her passing, but maybe additional time before her passing, which is probably not the intended meaning of the sentence.

Applying the filter: the answer choices are diverse. They all begin differently. In fact, the beginning of the answer choice comes directly after the modifying phrase that begins with "Alongside Petra..." Nothing other than the Taj Mahal can fit into that slot and be compared with Petra and the Great Wall of China. Answer choice (A) is the only viable option, despite its flaws, because it's the only one without a gross modifier error. The correct answer is (A).