Answer :
in 1952, when the federal communications commission lifted its ban on new television stations, there were 105 stations and 15 million households with television sets.
Here we need to complete the sentence in 1952, when the federal communications commission lifted its ban on new television stations, there were.
In this given question, the correct option is (A).
And the error in the sentence occurs at (A), here there is an improper idiom.
Basically the coordinating conjunction "and" requires parallel grammatical structures on either side of it, so the phrase "at nearly 35 million" should be "to nearly 35 million," to be parallel with the phrase that precedes "and" ("to almost 500").
Now, the corrected sentence is written as In 1952, when the Federal Communications Commission lifted its ban on new television station licenses, there were 105 stations and 15 million households with television sets, but by 1956 the number of stations had grown to almost 500 and the number of households with sets to nearly 35 million
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