Complete the sentence by filling in the blank with the correct tenses from the given choices by indicating your option.
She _________in Calcutta for a quarter of a century now.
has been living
had been living
She has been living in Calcutta for a quarter of a century now.
We use the Present Perfect Continuous to say how long something has been happening. The action began in the past, continues in the present or has just stopped, and may continue into the future with time words since, for, all day, all afternoon, every day this year, etc. Therefore in the given sentence 'has been living' is the correct answer. Other options are completely wrong.