There are three sentences given in the above sequence, of which two are mentioned and the one in the centre has to be guessed.
The first sentence speaks about Rama and his friends playing in an open area, and the third sentence describes how Rama stayed to help while the others fled. This states an incident which must have took place, which fills in the second sentence.
From the given four options, only Option A speaks about the incident of the leopard appearing and attacking, one of the boys, which is the most suitable answer, and also logically fills the gap between the first and the second.
The other options, however talk about the boy, the leopard and Rama’s bravery (which is evident in the third sentence as well), and do not fill in the slot in an appropriate manner, and are hence wrong.