The present perfect continuous tense is used for actions that started in the past and continue to the present. "Drizzling" is the specific word for light rain or "গুড়ি গুড়ি বৃষ্টি".

১. "It is raining" is present continuous, which doesn't correctly show the duration since morning.
২. The word "since" is used for a point in time, whereas "for" is used for a duration.
৩. "It has been raining" is correct, but "drizzling" provides a more accurate translation of the Bengali term.

অতিরিক্ত তথ্য: Drizzle refers to light liquid precipitation consisting of small water droplets.