Final answer:
The correct synonyms for bed linen are blankets and sheets, which refer to fabrics used for warmth and to cover the mattress respectively. Pillows are complementary to bed linen, and curtains are not related as they are used for windows.
Step-by-step explanation:
The synonyms for bed linen generally refer to various types of fabric items used on a bed for hygiene, warmth, decoration, and bed protection. The correct synonyms from the choices provided would be blankets and sheets. Blankets refer to the heavier, thicker bed coverings that provide warmth, while sheets are the pieces of fabric that are typically laid directly over the mattress or under the sleeper. Pillows, although part of bed linen in a broad sense, are not synonymous but rather complementary to bed linen. Curtains are not related to bed linen as they are a type of window treatment used to block or filter light and ensure privacy.