A.
Gerunds generally end in -ing, and the subject of the prepositional phrase "for meeting" is meeting, which means it is the object of a preposition.
Hope this helps!
Answer:
I read this book before, but some details are hazy so I'll try my best.
Nya thinks that her sister is to young, but her mother thinks that allowing (the sister) is nescessary.
Answer and Explanation:

→ Benefits of yoga.
→ Magic of maths.
→ Ayurveda a blessing.
→ Waste management.
→ Organic vs inorganic eatables.
→ Genetically modified crops.
→ Safety rules.
→ Eating habits.
→ Global Warming
→ Artificial Intelligence
→ Save earth
→ Save animals
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