Final answer:
The best answer to complete the sentence is option C. 'sin mangas', which means 'sleeveless'.
Step-by-step explanation:
The best answer to complete the sentence 'En el verano me gusta usar una blusa' is option C. 'sin mangas', which means 'sleeveless' in Spanish. This option is the most appropriate because it describes a characteristic of the blouse that would be suitable for summer.
Learn more about Spanish vocabulary for clothing