Perhaps it stands as a matter of definition, but if you ask me, C++ is safer than C. The fact that it is much stronger typed is enough for me to call it safer.
And the fact that you don't have to hunt for safe libraries (because they're standard!) makes C++ safer in my eyes.
And don't forget that it's somewhat impractical (due to much code duplication) for safe code or safe libraries in C, whereas in C++, there's much less need for such things.

It's all in how you see it.