Cynthia writes computer programs for mobile phones and has recieved five job offers in the past week this is most likely because

 High computer programmer's demand

Explanation: Computer programmer are the individual that have ability to design, create, troubleshoot ,write and manage a computer program.They tend to work on the source code of the program by using different and efficient programming languages.

According to the ability of Cynthia ,it depicts that she is skilled programming performer and has good knowledge of coding. The demand of the professional and skilled programmers are high in computer and software field and the supply is comparatively low. Thus, she is getting 5 offer letters of job from companies due to high demand.