A.) I was thrilled to find my keys they had been lost since yesterday.
This is a "fused sentence" or also known as a run-on sentence.
A was the correct answer, hope this help :3
Umm eating humans atakking other things idk
Sprang is to leave something/someone with a quick movement and strand is to leave Some one/something with out leaving your desired spot like if you were to break up with someone you left them by their self "stranded"