OPTION 1.The correct answer begins with sentence C as it is INTRODUCING a subject 'Mohan'.B & D make paired sentences as sentence B is talking about how kind Mohan and his wife are and their readiness to lend a helping hand. It is CONTINUED by sentence D saying they were always ready to help whether it was lending tools or watering fields.Sentence A is the last sentence as it is giving an overall opinion. Therefore, this sequence is followed by option 1 'CBDA'.