<span><em>~de qué estás hablando</em>
how to say it:
de: <em>day</em>
qué: <em>K</em>
</span>estás: <span><em>es-stas </em>
</span>hablando: <em>hey-bland-o</em>
<em>~Hope this helped! :)</em>
The answer is A, seras since you needed to conjugate it for the noun tu
Yeap it's fine
"Nosotros anduvimos rápidamente en la carretera"