Communication barriers in the classroom are the obstructions created due to miscommunication or communication gap unknowingly made by the teacher while conducting the class. It breaks the one-to-one connection to the students. Language barriers, personality differences are the major causes of communication barriers in the classroom environment. Language: Students with speech difficulty find it uncomfortable to align themselves to the pace of learning with others thereby lagging behind in studies. Similarly, the usage of verbatim by teacher unknown to the students makes it difficult to grasp the content taught. Boredom: A routine monotonous lecture series with the usual flow of methodology will make students quite bored and disinterested in their studies. The teacher ought to use thought-provoking assignments, group work, IT-enabled smart class in order to engage students in the study, and instil enthusiasm and creativity. An irrelevant illustration can make classroom communication less interesting. Personality Differences: Students with diverse backgrounds have differentiated personalities due to the cultural background and environment they belong to therefore teachers have to deal individually with the students in order to teach them and use dynamic learning styles depending on the capabilities of the students. A teacher should not make the mistake to assume all the students as equal with respect to their mental capabilities hence teacher should cater to the needs of each student as per their convenience. For instance, a teacher must make some special arrangement to those students who are not able to see the writings on the blackboard (Due to distance) Therefore option 3 is the correct answer.