Which sum will be irrational?

A. 3 + 2
B. start root 19 end root plus start fraction 7 over 2 end fraction
C. Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction.
D. –6 + (–3.251)

B. start root 19 end root plus start fraction 7 over 2 end fraction

The sum that will be irrational is option B: √19 + (7/2). The square root of 19 is an irrational number, and adding it to a rational number (7/2) will result in an irrational sum.