Take another look at the sentence:

While Karen was cleaning green peppers at the sink, Chris __________ a long, fat anchovy onto the pizza, camouflaging it with sliced mushrooms and onions.

Chris put the anchovy on the pizza. Thus, you need a form of lay. Since the sentence is past tense, you need the simple past form. Consult the table below or review the rules.

Layed, the choice you made, is a spelling error.

Infinitive Definition Simple Present Simple Past Past Participle Present Participle
to lay to put something down lay(s) laid laid laying
to lie to rest or recline lie(s) lay lain lying

Go to the next sentence.

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