What can be done in 'C' but not in 'C++'?

Question

If 'C++' is built upon 'C' and has all the features 'C' can offer, why do people still use 'C' instead of just 'C++'? is there some specific tasks that can only be done with 'C'?

Answer 1

A bit smaller overhead and writing and programming style I think is what makes some people prefer C. Also general use C++ relies more than C on its std library