A kitchen shop sells saucepans in sizes small, medium and large. on a given day, 100 people each bought at least 1 saucepan from the shop. 4 people bought all 3 sizes of saucepan. in total, 29 people bought a small saucepan, of which 13 also bought a medium saucepan. 7 people bought a small saucepan and a large saucepan. in total, 68 people bought a medium saucepan, of which 16 also bought a large saucepan. how many people bought a large saucepan?

a) 39 people
b) 40 people
c) 41 people
d) 42 people