Concept:Surah Al-Isra', verses 23-24, focuses on the duty of showing kindness and respect to parents.
Explanation:Allah first commands that none be worshipped except Him.
Immediately after this, He instructs believers to be kind to both parents.
The Qur'an states that when one or both parents reach old age, children must not say even a word of disrespect to them.
Children should not scold or rebuke their parents.
Instead, they must speak to them with honour and gentleness.
These verses also teach that children should lower their wing of humility before parents and pray for Allah's mercy upon them, because parents cared for them when they were young.
This constant, daily care and appreciation is clearly taught in Surah Al-Isra'.
Therefore, the central lesson of Q 17:23-24 is kindness to parents, not merely obedience to authority or sincerity in worship in general.
Answer:A. Kindness to parents.