If f(x)=1.7x^5-5.3x^2+9.8 and if r is the only real number such that f(r)=0, then r is between

a. -1.4 and -1.3
b. -1.3 and -1.2
c. -1.2 and -1.1
d. -1.1 and 0
e. -1.0 and -0.9

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