The third omniscent point of view is when the narrator knows exactly what the character feels, thinks and acts. Taking this in viewpoint and looking over your question I would say option d is the answer.
Seventy years ago, an advanced cataract <u>statistically</u> doomed the sufferer to creeping blindness.
The answer to the given sentence above would be a complex sentence. What makes it complex is that, it contains an independent and a dependent clause. The clauses are connected by a subordinating conjunction which is the word "although". Hope this answers your question.