Concept: The question tests on the basics of fractions.
The expression can be defined if the denominator is defined
- a should not 2 if x is -2 (else the denominator would be 0 leading to an undefined value of the expression)
- a should not be less than 2 else at x=-2 the value of a + x or a-2 will turn negative leading to an undefined denominator and hence an undefined fraction.
Thus the expression is not defined for a<= 2
St (1) If a = 5 it is > 2 and hence YES is the answer derived for the question stem.
St (2) If b =6 we have the numerator as -2 + 6 =4 but we know nothing of the denominator. Hence (Insufficient).
Hence option (A)