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Choose the word which has the underlined part pronounced differently from the rest.

A. stove 

B. cold

C. worry

D. hold

P = \(\dfrac{-1}{20}+\dfrac{-1}{30}+\dfrac{-1}{42}+\dfrac{-1}{56}+\dfrac{-1}{72}+\dfrac{-1}{90}\)

= \(\left(\dfrac{1}{4\cdot5}+\dfrac{1}{5\cdot6}+\dfrac{1}{6\cdot7}+\dfrac{1}{7\cdot8}+\dfrac{1}{8\cdot9}+\dfrac{1}{9\cdot10}\right)\cdot\left(-1\right)\)=

\(\left(\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{10}\right)\cdot\left(-1\right)\)

=\(\left(\dfrac{1}{4}-\dfrac{1}{10}\right)\cdot\left(-1\right)\)

=\(\dfrac{3}{20}\cdot\left(-1\right)\)

=\(\dfrac{-3}{20}\)

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