C-type asteroid
The largest unequivocally C-type asteroid is 10 Hygiea, although the SMASS classification places the largest asteroid, 1 Ceres, here as well, because that scheme lacks a G-type.
2018 GE3
In observational history, and other than possibly 2002 MN and , this asteroid is the largest known object to ever pass that close to Earth, as well as the Moon "(also see History of closest approaches of large near-Earth objects)". 99942 Apophis will break both of these records when it approaches only from Earth on 13 April 2029.