The answer is A 100 percent. Because you are trying to raise another exception while handling ZeroDivisionError using keyword "raise...from..." which is explicit chaining, but as OwnMath is not derived from any superclass exception, resulting in Typeerror. However, your previous exception will be preserved by the python, i.e. typeerror is linked to zerodivision error, which happened because of the __context__ attribute. So, this is implicit chaining.
OwnMath should be derived from BaseException. Run this code and you'll get an exception. If it is derived, it's an example of explicitly chained exception.
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