Meaning of 'to be careful'

[Sonka]

Test No. incompl/elem-3 "Drive carefully", question 2

Please be ......... when you cross this road.

(a) careless
(b) carefree
(c) caring
(d) careful

Test No. incompl/elem-3 "Drive carefully", answer 2

Please be careful when you cross this road.

Correct answer: (d) careful
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WHY USE CAREFUL?

Sonka

[Alan]

Here this means taking care/being attentive.
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English as a Second Language
You can read my ESL story Communicating with you?

[Anubala]

I come up with meaning of each word ... then it is easy to choose correct one.

(a) careless - negative of careful
(b) carefree - free from troubles (relax state)
(c) caring - look after
(d) careful - cautious