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Combinatorics Difficulty 3.0 AMC 10/12 Find the answer Canada

In a soccer league with $6$ teams ( $P$ , $Q$ , $R$ , $S$ , $T$ , $W$ ), each team must eventually play each other team exactly once. So far, $P$ has played one match, $Q$ has played $2$ matches, $R$ has played $3$ matches, $S$ has played $4$ matches, and $T$ has played $5$ matches. How many matches has $W$ played so far?

(A) $1$ (B) $2$ (C) $3$ (D) $4$ (E) $5$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.