The correct option is A Linum usitatissimum
Flax with the binomial name Linum usitatissimum, is a member of the genus Linum in the family Linaceae. It is a food and fiber crop that is grown in cooler regions of the world. In addition to referring to the plant itself, the word "flax" may refer to the unspun fibers of the flax plant. Flax fiber is extracted from the bast or skin of the stem of the flax plant. Flax fiber is soft, lustrous and flexible. Bundles of fiber have the appearance of blonde hair, hence the description "flaxen". It is stronger than cotton fiber but less elastic. Thus, option A is correct.