I had to be vigilant until each mouthful was safely behind my teeth.
I had to be vigilant until each mouthful was safely behind my teeth.
(A) Careful
(B) Versatile
(C) Serious
(D) Fast
“Vigilant” is the state of remaining watchful and alert, and being careful to avoid danger and trouble. In the above sentence, the word is used to signify that the person had to be extra careful while consuming the food. So, the word that suits best in this context is “careful.”