The power struggle between Pope Gregory VII and Henry IV is the disagreement over who should construct monasteries.
When the power struggle occurs?
When adults try to manage children inappropriately, or children want control beyond their age and competence, power battles occurs.
Children make the greatest drive for power when they are two years old and when they are teenagers.
The argument over who should build monasteries is at the heart of the power struggle between Pope Gregory VII and Henry IV.
Therefore, option B is correct.
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