Step 1: Understand the heart of the question.
We must decide why adaptation is needed in an inclusive classroom by judging statements $J, K, L, M$.
Step 2: Recall the spirit of inclusion.
Inclusive education exists so that every learner, regardless of ability, can take part and learn fairly, never to chase marks alone.
Step 3: Test statement J.
$(J)$ To consider different learning styles is a core reason for adaptation, since learners absorb knowledge differently. $J$ is correct.
Step 4: Test statements K and L.
$(K)$ To ensure participation of all students is the very definition of inclusion, and $(L)$ To provide equal learning opportunities reflects the equity goal. Both are correct.
Step 5: Test statement M.
$(M)$ To improve only examination results is too narrow and ignores participation and equity, so $M$ is rejected.
Step 6: Combine and conclude.
The valid reasons are $J$, $K$, and $L$, matching option D.
\[ \boxed{\text{D. } J, K \text{ and } L} \]