Answer:
nasty : unpleasant because they are both synonyms for each other.
Explanation:
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"The curtains were covered in dust and smog, like the rest of the city, both slowly decaying in their age."
A run-on sentence is two incorrectly joined independent clauses.
That is the case of the B.
The two clauses are 1) "Movies are a great escape", and 2) "I go to the cinema often".
You can fix the error by using end punctuation or a semicolon after the first clause.