why do I should choose worry not think?

[gogo]

English Grammar Tests, Elementary Level

ESL/EFL Test #56 "Chit Chat: In the Aeroplane", question 2

Mike: Yes, lots of times. There's no need to ......... about it.

(a) worry
(b) think
(c) ponder
(d) brood

English Grammar Tests, Elementary Level

ESL/EFL Test #56 "Chit Chat: In the Aeroplane", answer 2

Mike: Yes, lots of times. There's no need to worry about it.

Correct answer: (a) worry

Your answer was: incorrect
Mike: Yes, lots of times. There's no need to think about it.
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why do i should choose worry not think?

gogo

[Lili6]

what is difference between worry about and brood about/over

I have check dictionary, they have the same meaning...

thank you

[Beeesneees]

That's a really good question, Lili.
'Brooding' is a specific type of 'worrying' which involves thinking deeply about something in a very introspective way for a long period of time.
Although the passenger may well have been brooding about his forthcoming flight, it would be very unusual for the other person to use that term in simple conversation with someone I presume he doesn't know well (from the fact that she has to ask him if he's flown before).
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Cheers m' dears!