The correct option is A \N
If f(x) has a maxima at x=0, then
f(0+h)≤f(0)f(0−h)≤f(0)}
limh→0−h3+1≤1⇒1≤1
limh→0 (a2−5a+7+h)≤1
⇒a2−5a+7≤1
⇒a2−5a+6≤0
⇒(a−2)(a−3)≤0
⇒2≤a≤3
For a=2, limh→0+ (1+h) which is greater than 1.
∴a≠2
For a=3, limh→0+ (1+h) which is greater than 1.
∴a≠3
Hence, there is no integral values of x for which the given function can have a maxima at x=0.