The correct answer is: both (a) and (b)
The land-sea distribution or the positions of the world’s continents and major oceans influences the major pressure belts that develop from the general circulation of the atmosphere. The major pressure belts are the equatorial low pressure belt, the subtropical high pressure belt, the mid-latitude low pressure belt, and the polar high pressure belt. The location of these pressure belts is affected by the distribution of land and sea. Land heats up and cools down more quickly than water, so the pressure belts are located differently over land and sea.
The land-sea distribution also influences the development of the mid-latitude cyclonic depressions, at the convergence zone between polar and tropical air masses. These depressions are caused by the difference in temperature and pressure between the two air masses. The land-sea distribution affects the temperature and pressure of the air masses, which in turn affects the development of the depressions.
Option A is correct because the land-sea distribution influences the major pressure belts that develop from the general circulation of the atmosphere. Option B is correct because the land-sea distribution influences the development of the mid-latitude cyclonic depressions, at the convergence zone between polar and tropical air masses. Therefore, the correct answer is both (a) and (b).