At a management institute (where students can choose more than one subject), out of 300 students, 55 did not choose any of the marketing, finance or systems. 110 chose marketing, 130 chose finance, and 140 chose systems. 45 students chose marketing and finance, 50 students chose marketing and systems and 60 chose finance and systems. How many students chosen exactly one subject?

Choices

a. 20 

b. 115 

c. 35

d. 28