To answer this question, you need to have knowledge about the visits made by different popes to Mother Teresa at her missionary headquarters.
Option A) Pope John Paul I - This option is incorrect because Pope John Paul I served as pope for a very short period, from August 26, 1978, until his death on September 28, 1978. Therefore, it is unlikely that he visited Mother Teresa at her missionary headquarters.
Option B) Pope Benedict XVI - This option is incorrect because Pope Benedict XVI served as pope from April 19, 2005, until his resignation on February 28, 2013. There is no record of him visiting Mother Teresa at her missionary headquarters.
Option C) Pope John Paul II - This option is correct because Pope John Paul II, who served as pope from October 16, 1978, until his death on April 2, 2005, visited Mother Teresa at her missionary headquarters in Kolkata, India in 1986.
Option D) None - This option is incorrect because Pope John Paul II did visit Mother Teresa at her missionary headquarters, as mentioned in Option C.
Therefore, the correct answer is C) Pope John Paul II. This option is correct because Pope John Paul II visited Mother Teresa at her missionary headquarters in Kolkata, India in 1986.