Question

1) It was hard to him to speak out loud, but he managed to murmur something.
2) It was hard on him to speak out loud, but he managed to murmur something.
3) It was hard for him to speak out loud, but he managed to murmur something
3) It was hard upon him to speak out loud, but he managed to murmur something.
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Answer 1

Answer:

3) It was hard for him to speak out loud, but he managed to murmur something.