The French and Indian War had several contributing factors. From your list, the following reasons apply:
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French and British both wanted control of the Ohio River Valley: This is correct, as the Ohio River Valley was a key area for trade and expansion for both colonial powers.
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French and British fought over control of Native American trade: This is also correct, as both the French and British sought alliances and trade relations with various Native American tribes, which were critical for controlling the region's resources and trade routes.
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Rivalry over hunting grounds: This is a valid reason, as competition for hunting and trapping areas contributed to tensions between the French and British.
The other options you mentioned are not primary causes of the war:
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The French wanted to take control of the Louisiana area that was claimed by Spain: This is not a primary cause of the French and Indian War, as the war primarily focused on the British-French rivalry in North America, particularly in the Ohio River Valley, rather than on the Spanish claims in Louisiana.
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The English wanted control over Florida, which had been claimed by the French: This statement is inaccurate. Florida was primarily a Spanish territory at that time, and the conflict did not focus on gaining control over it as a primary objective.
In summary, the core reasons relate primarily to territorial control and competition for trade in the Ohio River Valley and with Native Americans.