In the following questions, a part of the sentence is printed in bold. Below are given alternatives to the bold part at (1), (2), (3) which may improve the sentence. Choose the correct alternative. In case no improvement is needed your answer is (4).
Anyone interested in computer programming can find a job in contemporary industry if you learn the basic programming languages, such as COBOL and FORTRAN.

• by studying

• by the study of 

• if he would learn

• if he would learn