Which of the following words is closest in meaning to “Vigilant”?

Vigilant means keeping careful watch.

• Correct answer - watchful: it has the same meaning as Vigilant.
• drowsy: sleepy - wrong, it does not mean the same as Vigilant.
• careless: not taking care - wrong, it does not mean the same as Vigilant.
• active: energetic - wrong, it does not mean the same as Vigilant.