Read the excerpt and look at this dictionary entry for the word rivet.
(3) On the train, fair women, with tottering bables on each arm, stopped their haste and scrutinized the children of
absent mothers. Large men, with heavy bundles in their hands, halted near by, and riveted their glassy blue eyes upon
US.
rivet
verb (used with object), riv-et-ed, riv-et-Ing.
1. to fasten with a rivet or rivets.
2. to hammer or spread out the end of (a pin, bolt, etc.) in order to form a head and secure something; clinch
3. to fasten or fix firmly.
4. to hold (the eye, attention, etc.) firmly

Which definition best represents the meaning of riveted as it is used in paragraph 3?
OA definition 1
OB. definition 4
OC. definition 3
OD. definition 2