${\color{Red}{\text{Too}}}$ is an adverb that can mean ${\color{Green}{\text{“excessively” or “also.”}}}$
${\color{Blue}{\text{Two}}}$ is pronounced the same as ${\color{Teal}{\text{to}}}$ and ${\color{Red}{\text{too}}}$, but it can’t be used instead of either of them because it’s a number.
${\color{Teal}{\text{To}}}$ is a preposition with several meanings, including ${\color{Lime}{\text{ “toward” and “until.”}}}$
After playing ${\color{Blue}{\text{two}}}$ hours of tennis, I am feeling ${\color{red}{\text{too}}}$ tired to walk back.
Correct Answer $:\text{D}$
Reference: https://www.grammarly.com/blog/to-too/