Select the word segment which substitutes the bracketed word correctly and completes the sentence meaningfully.
I (am here) since 1981.

Correct option is A

The correct substitution of the bracketed words is (a) have been here.
The present perfect continuous tense "have been here" is used to describe an action that started in the past and continues to the present.
Meanings of other options:
· had been here: past perfect tense, used for actions completed before another action in the past.
· was here: simple past tense, used for actions that occurred at a specific time in the past.
· has been here: incorrect tense for the context.