Choose the correct tense. [২৩বিসিএস-BCS]

(ক) Javed was so exhausted that he lain down for a sleep
(খ) Javed was so exhausted that he had lain down for a sleep
(গ) Javed was so exhausted that he was lying down for a sleep  √
(ঘ) Javed was so exhausted that he will lay down for a sleep