![Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]](https://www.gkseries.com/blog/wp-content/uploads/2023/10/Determine-the-correctness-or-otherwise-of-the-following-Assertion-A-and-the-Reason-R-1024x536.jpg)
Q. Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]
Assertion [A]: For a material exhibiting Coble creep, a reduction in grain size results in a significant increase in creep rate
Reason [R]: Grain boundaries act as a barrier to motion of dislocations
A. Both [A] and [R] are true and [R] is the correct reason for [A]
B. Both [A] and [R] are true, but [R] is not the correct reason for [A]
C. Both [A] and [R] are false
D. [A] is true but [R] is false
Ans: Both [A] and [R] are true, but [R] is not the correct reason for [A]