Which of the following is a fiber?

Cashmere wool, usually simply known as cashmere, is a fiber obtained from cashmere goats, pashmina goats, and some other breeds of goat. It has been used to make yarn, textiles and clothing for hundreds of years.

Cashmere is closely associated with the Kashmir shawl, the word "cashmere" deriving from an anglicisation of 'Kashmir', when the Kashmir shawl reached Europe in the 19th century.

A number of countries produce cashmere and have improved processing techniques over the years, but China and Mongolia are two of the leading producers as of 2019. Afghanistan is ranked third.

Cashmere wool is collected during the spring moulting season when the goats naturally shed their winter coat. In the Northern Hemisphere, the goats moult as early as March and as late as May.