Choose the correct ordinal numbers.

Choose the correct option.

17 — [The seventeenth|The seventeen|Seventeenth|A seventeenth]
15 — [The fifteenth|The fifteen|The fiveteenth|The fiveteen]
14 — [Fourteenth|The fourteenth|A fourteenth|The fourteen]
18 — [Eighteenth|The eighteenth|A eighteenth|The eighteen]
20 — [The twentyth|The twenty|The twentieth|A twentieth]
13 — [The thirteen|A thirteenth|The threeteenth|The thirteenth]