Which of the following is a sex-linked character?

Correct option is Red blue colorblindness.
Sex-linked character, an observable feature of an organism controlled by the genes on the chromosomes that determine the organism's sex. Several traits including red-green color blindness, arise from the interaction of genes that are located on the X chromosome. There are three main kinds of color blindness, based on photopigment defects in the three different kinds of cones that respond to blue, green, and red light. Red-green color blindness is the most common. So, the correct answer is 'Red blue colorblindness'