On a motorway, from this sign onwards...
A)all previous prohibitions end, including the prohibition on exceeding a speed of 70 kilometres per hour.
B)the recommended maximum speed is 70 kilometres per hour.
C)the prohibition on exceeding a speed of 70 kilometres per hour ends.Correct
When we encounter a round sign with a white background and a diagonal line through it, it will always indicate the end of some imposed prohibition.
In the photo in the question, that sign indicates the point from which a previous maximum speed sign ceases to apply.