Any group of people will also consist of a number of a. backgrounds b. occupations c. cultures d. subgroups

The right answer is the letter D.

Thus the complete sentence would be:

"Any group of people will also consist of a number of subgroups."

What explains the "letter D" as the correct alternative is that a subgroup is composed of any group of elements, individuals, or quantity of material that have one or more characteristics in common

appropriate

adjective: correct or right for a particular situation or occasion

verb 1: to take and use for a purpose

verb 2: appropriate also means to steal

inappropriate

unsuitable, esp. for the particular time, place, or situation:

you need to know what you have learned: )