Question

Audience sizing enables the on-line marketer to know about the
number of_______ that visited the on-line site.

(groups, outlets, persons)​

Answer 1

Answer:

groups I thought this is the answer

Answer 2

Persons

Audience sizing

Audience sizing allows us to find and take action from visitors based on their behavior. After specifying a date range and rules as included, your audience data is searched by visitor profiles that match your preferred method.

Hence, person can be filled in the blank space. The sentence will be:

Audience sizing enables the on-line marketer to know about the

number of person that visited the on-line site.