A student hypothesized that girls in his class had the same blood pressure levels as boys. The probability value for his null hypothesis was 0.

A student hypothesized that girls in his class had the same blood pressure levels as boys. The probability value for his null hypothesis was 0.15. So he concluded that the blood pressures of the girls were higher than boys'. Which kind of mistake did he make? 

a. Type I error 

b. Type II error 

c. Type I and Type II error 

d. He did not make any mistake