Function p is continuous, increasing, and concave down on [1,4]. Four equal-width approximations to ∫14p(x)dx are computed: L (left endpoints), R (right endpoints), M (midpoints), and T (trapezoidal rule). Which of the following lists these four approximations in order from least to greatest?
a) L<M<T<R
b) R<M<T<L
c) L<T<M<R
d) T<L<R<M