choose the correct indefinite article for the following word.\nclase\n\nun\nuna\nunos\nunas

Brief Explanations:

In Spanish, "clase" is a feminine singular noun. The indefinite article for feminine singular nouns is "una". "un" is for masculine singular, "unos" for masculine plural, and "unas" for feminine plural. So the correct indefinite article for "clase" is "una".

Answer:

B. una