You haven't provided any choices for the "which of the following" part of your question. Such questions are best avoided here. However, assuming a, b and c are all natural numbers, all of the following are true for a<b AND b+c=10:
a=1, b=2, c=8
a=1, b=3, c=7
a=1, b=4, c=6
a=1, b=5, c=5
a=1, b=6, c=4
a=1, b=7, c=3
a=1, b=8, c=2
a=1, b=9, c=1
a=2, b=3, c=7
a=2, b=4, c=6
a=2, b=5, c=5
a=2, b=6, c=4
a=2, b=7, c=3
a=2, b=8, c=2
a=2, b=9, c=1
a=3, b=4, c=6
a=3, b=5, c=5
a=3, b=6, c=4
a=3, b=7, c=3
a=3, b=8, c=2
a=3, b=9, c=1
a=4, b=5, c=5
a=4, b=6, c=4
a=4, b=7, c=3
a=4, b=8, c=2
a=4, b=9, c=1
a=5, b=6, c=4
a=5, b=7, c=3
a=5, b=8, c=2
a=5, b=9, c=1
a=6, b=7, c=3
a=6, b=8, c=2
a=6, b=9, c=1
a=7, b=8, c=2
a=7, b=9, c=1
a=8, b=9, c=1
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