Question 335925
A 6,8 and 10
B 2,3 and 4
C 5,12 and 13
D 8,15 and 17
<pre><b>
Try them all in the Pythagorean theorem and see
which ones, if any, check correct and which ones,
if any, don't check:

6² + 8² = 10²
36 + 64 = 100
    100 = 100

That checks.

2² + 3² = 4²
 4 +  9 = 16
     13 = 16 

That doesn't check.

5² + 12² = 13²
25 + 144 = 169
     169 = 169

That checks.

8² + 15² = 17²
64 + 225 = 289
     289 = 289

So the only one that doesn't check is 

B 2,3 and 4

Edwin</pre>