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Hi teachers,
Context:
He was my sister’s youngest son, Marta said happily. He’s a very nice boy.
The policeman whispered in Felix’s ear. Felix looked sadly at Marta. Your sister and all her family live in Australia, Marta. Who was the man in your house?

Would the following be suitable questions and answers?
a) Did the policeman speak very softly to Felix? Yes, he did.
b) Was the young man in Marta’s house her sister’s son? No, he wasn't
c) How did Felix know it? Because the policeman told him (that) her sister and family lived in Australia.

I basically want to check letter 'c'. I wrote the others just to follow the sequence.

Aside: should it be, 'to follow' or 'for following'

Thanks in advance.
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a) How did the policeman speak to Felix? Softly.
b) Was the young man in Marta’s house her nephew? No, he wasn't
c) How did Felix know that? Because the policeman told him (that) her sister and family lived in Australia.

I wrote the others just to follow the sequence.
Comments  
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Hi Mister Micawber,
Thank you for your reply.

a) How did the policeman speak to Felix? Softly. It is much better, isn't it?
b) Was the young man in Marta’s house her nephew? No, he wasn't. It is such a good one!
c) How did Felix know that? Because the policeman told him (that) her sister and family lived in Australia.

I keep on doing the same mistake. I, many times, write 'it' instead of 'that'. I such use 'that' to substitute a sentence.
Is that so?

TS
Thinking Spain I such use 'that' to substitute a sentence. Is that so?
That is generally, the case, yes. 'That' refers to something more complex than just a thing (a noun).
Hi Mister Micawber,
Thank you for your reply.
a) How did the policeman speak to Felix? Softly.
Could 'whispering' be the answer too? Or this one, 'He whispered something in his ear'?

TS
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Yes, those are probably better, now that I re-read the text.