Select the most appropriate option to fill in the blank.

I signed this science project ______ London.

in

The correct option to fill in the blank is in.

The word "in" is used to indicate a location or position. In this case, the science project was signed in London.

The other options are incorrect.

• Beneath means "below" or "underneath". It is not the correct word to use in this sentence because the science project was not below or underneath London.
• By means "near" or "close to". It is not the correct word to use in this sentence because the science project was not near or close to London.
• Into means "to the inside of". It is not the correct word to use in this sentence because the science project was not signed into London.