The correct answer is A. Increase capacity.
A cellular network is a network of radio cells, each controlled by a base station. The size of a cell is the area that can be covered by a base station. The smaller the cell size, the more cells can be accommodated in a given area, and the greater the network capacity.
There are several reasons why the size of a cell is kept small in a cellular network. First, it allows for more users to be connected to the network at the same time. Second, it reduces the distance that signals have to travel, which improves signal quality. Third, it makes it easier for handoffs to occur, which is when a user’s connection is transferred from one base station to another as they move around.
The other options are incorrect. Option B, decrease capacity, is the opposite of the desired effect. Option C, increased size of base station electronics, is not a factor in determining cell size. Option D, slow process of handoffs, is a potential problem with large cells, but it can be mitigated by using more sophisticated handoff algorithms.