Answer: Option 'A' is correct.
Step-by-step explanation:
Since we have given that
Total students in a class = 30
Number of students is to be chosen = 4
So, we will use Combination :
<u>As Combination is the collection of the object irrespective of any arrangement.</u>
So, Number of ways to choose 4 students among the 30 students is given by

Hence, Combination is the required answer.
Therefore, Option 'A' is correct.