Select the most appropriate option to fill in the blank.

William ______ his friends not to intrude into his family’s affairs.

warned

The correct option to fill in the blank is warned.

The sentence is about William telling his friends not to intrude into his family's affairs. The word "warned" is the most appropriate word to use in this context because it means to caution someone about something. It is clear from the sentence that William is trying to prevent his friends from meddling in his family's business.

The other options are not as appropriate.

• Claimed means to state something as true, even though it may not be. This does not make sense in the context of the sentence because William is not making a statement about his family's affairs, he is warning his friends not to interfere.
• Gambled means to take a risk in the hope of winning something. This does not make sense in the context of the sentence because William is not taking a risk, he is trying to protect his family from his friends.
• Satisfied means content or pleased. This does not make sense in the context of the sentence because William is not expressing contentment, he is expressing concern.