The simple subject of the Fourth Amendment is: a. the people Incorrect b. searches c. warrants d. the right

I'm Pretty sure the correct answer would be d

This is the whole Fourth Amendment:

The right of the people to be secure in their persons, houses, papers, and effects,[a] against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized

As you can see here, the subject of the sentence is the phrase the right, so the correct answer is D. the right.