He remained in his chair and with abstracted eyes stared at the table.

Correct option is B

The correct antonym of abstracted is (b) alert.
· Abstracted: Showing a lack of concentration on what is happening around.
· Abstracted (Hindi meaning): ध्यान विचलित होना.
· Example: He was so abstracted that he didn’t hear the phone ring.
· Alert: Quick to notice and respond to situations.
Antonyms: Attentive, alert, focused.
Synonyms: Distracted, preoccupied, absent-minded.
Meanings of other options:
· Lustful: Having strong sexual desires (कामुक).
· Distracted: Unable to concentrate due to worry or anxiety (ध्यान विचलित).
· Unemotional: Not showing feelings or emotions (निर्विकार).