B) Write down the reciprocal of 7.

1/7

Step-by-step explanation:

The product of reciprocals is 1.

The reciprocal of a number is 1 divided by the number.

If the number if a fraction, just flip it. If the number is not a fraction, write it as a fraction by writing it as a fraction over 1, then flip it.

Examples:

The reciprocal of 5 is 1/5. Write 5 as 5/1. Flip it to 1/5.

The reciprocal of 11 is 1/11. Write 11 as 11/1. Flip it to 1/11.

The reciprocal of 4/5 is 5/4.

The reciprocal of 1/15 is 15/1 which is simply 15.

Your problem:

The reciprocal is 7 is 1/7.