The correct answer is option A, that is, extreme temperature changes between seasons.
If the planet B has an axis tilted at 45 degrees to its orbit of the sun the seasons would be more extreme. Some places on the planet would be in the night for weeks or months and others would be in the perpetual light for as far as long. The difference between the seasons is mainly because of axial tilt, so the planet would get colder winters and hotter summers.