Answer is 2.
option 1- While using modules when developing a program, program can be divided into smaller programs which allows the developer to work simultaneously and which results in faster development of a program. So option 1 is a benefit.
option 3- Since there are many smaller programs, developers can easily find the errors and debug easily. So, it is also a benefit.
option 4- Module code can be resued or modified according to the demand, this is also a benefit.
option 2- If or not, program which contains modules run faster than the program without module, it has nothing to do with the development, it is for after development. So this is not the benefit and hence the answer is option 2.
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