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Real analsis

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Let f(x)=sinx and P={0,19,14,13,12,1} ,Q={0,14,12,1} are two partitions of the interval [0,1].Then which of the following statement is true?

(a) U(f,Q)−L(f,Q)≤U(f,P)−L(f,P).

(b) U(f,Q)≤U(f,P).

(c) L(f,P)≤L(f,Q).

(d) L(f,Q)≤L(f,P).

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