Answer:
secretly
Step-by-step explanation:
Dictionary
sur·rep·ti·tious·ly
/ˌsərəpˈtiSHəslē/
adverb
in a way that attempts to avoid notice or attention; secretively.
"Mary surreptitiously slipped from the room"
Definitions from Oxford Languages
D) secretly
because he did it at the corner of his eye
5.7m questions
7.5m answers