Meaning of 'Take it easy'

[Gelawani]

English Grammar Tests, Elementary Level

ESL/EFL Test #32 "Responses (5)", question 1

Jill: 'I'm so confused, I don't know what to do.'
Frank: '.........'

(a) Take it free.
(b) Take it easy.
(c) Take it light.
(d) Take it relaxed.

English Grammar Tests, Elementary Level

ESL/EFL Test #32 "Responses (5)", answer 1

Jill: 'I'm so confused, I don't know what to do.'
Frank: 'Take it easy.'

Correct answer: (b) Take it easy.
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please tell the correct answer and its reason.

Thanks
Gelawani

[Lost_Soul]

take it easy means relax, dont worry over such trifles