A claim is simply a statement of opinion, your point of view regarding a topic however, a strong claim is an argument should be significant, which sentence contains the most significant claim
It is subjective to determine which sentence contains the most significant claim without specific context or examples. However, here is an example of a sentence that could be considered to have a significant claim:
"The use of renewable energy sources is crucial for combating climate change and ensuring a sustainable future for our planet."
This sentence makes a significant claim by stating that renewable energy sources are not only important but also necessary for addressing a global issue like climate change and securing the well-being of the Earth.