All of these are wrong answers.

Why not B -> ran is not defined.
If "ran" mean "num" your result will be different than requested.
Because first you will multiply and after filter results. JS CLI RESULT -> (2) [6.25, 8.75].
Workers that produce less than $10 before multiply is not included in this result but was requested that workers that produces less than $10 have to be multiplied and this result added in a new array. The expected result is an array of 4.

Once we have 8, 5, 9 and 7. Our expected results is [10, 6.25, 11.25, 8.75].

Why not C -> We have an attribution. Then this result will be [1.25, 1.25, 1.25, 1.25].
To C be a correct answer we need to change to this.

The correct answer should be:
Option 1:
let arrl = arr.filter((val) => val < 10).map((num) => num *= 1.25);

Option 2:
let arrl = arr.filter((val) => { return val < 10}).map((num) => { return num * 1.25 });

Answer should be C

First we need to specify workers who makes less than 10 bucks in an hour we have to filter first then we will map the filtered array.

let arr = [8, 5, 9, 75, 11, 25, 7, 75, 13, 25];

let arr1 = arr.filter((val)=> (val<10)).map((num) => (num * 1.25));