Four people at Pia's Pottery Shop each make 21 mugs and 18 pottery bowls. Three people at Jason's Craft Shop each make the same number of mugs and twice as many bowls. How many objects did the seven people make in all?
a) 147 mugs, 216 bowls
b) 105 mugs, 162 bowls
c) 168 mugs, 252 bowls
d) 126 mugs, 198 bowls