Final answer:
The most common ending number for NOS codes is 7.
Step-by-step explanation:
The correct answer is A) 7.
The National Occupational Classification (NOC) is a system used in Canada to classify and categorize different occupations.
The NOC codes are four-digit codes that represent different job categories. Each code is followed by a two-digit number that further specifies the occupation.
Most of the NOS codes end with the number 7.
For example, in the provided information, we can see the codes 8642-107 and 87642-1300, which both end with 7.