The linking word (connector) “…whether…” (line…) means the same as:I - He seemed undecided whether

The linking word (connector) “…whether…” (line…) means the same as:
I - He seemed undecided whether to go or stay.
II - It remains to be seen whether or not this idea can be put into practice.
III - She asked whether I wanted a drink.
IV - We didn’t know whether we should write or phone.
Is(are) correct:

a

I, II and III

b

I

c

I and II

d

I and IV

e

all of them

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