Jill Earns an Income of $2,000 a Week and Goes

Jill earns an income of $2,000 a week and goes out to dinner 4 times a week. If her income increased to $2,100 she would go out to dinner 5 times a week. Jill's income elasticity of demand is

A) 0.22
B) 4.56
C) 2.28
D) -0.22