Here's why:

* tRNA's role in translation: tRNA is responsible for carrying amino acids to the ribosomes, where they are assembled into proteins. This process, called translation, occurs in the cytosol.

* Ribosomes reside in the cytosol: Ribosomes, the protein synthesis machinery, are located in the cytosol.

* tRNA needs to be readily available: For efficient translation, tRNA molecules need to be readily available in the cytosol, near the ribosomes where they perform their function.

However, it's important to note that while tRNA is primarily found in the cytosol, a small portion might be present in other cellular compartments, such as the nucleus, where it is transcribed and processed.