A Factory Worker Earned $10 an Hour in 1985,when the Consumer

A factory worker earned $10 an hour in 1985,when the consumer price index (CPI) was 63.0.The same factory worker was earning $15 an hour in 1990,when the CPI was 78.4.From 1985 to 1990,the factory worker's hourly real wage

A) increased from $6.30 to $11.76.
B) increased from $15.87 to $19.13.
C) remained constant.
D) increased from $10 to $15.
E) decreased from $15 to $10.