What is the total number of students having specialisation in IR, marketing and IT?

Answer: Option D

Number of students in various specialisations:
$$\begin{array}{rl}& \text{IB → }\frac{19}{100}\times 8000=1520\\ & \text{IR → }\frac{16}{100}\times 8000=1280\\ & \text{Finance → }\frac{12}{100}\times 8000=960\\ & \text{Marketing → }\frac{22}{100}\times 8000=1760\\ & \text{IT → }\frac{17}{100}\times 8000=1360\\ & \text{HR → }\frac{14}{100}\times 8000=1120\end{array}$$

Required number of students
= 1280 + 1760 + 1360
= 4400