In His Study, Geraldo Uses the Following Measure

Multiple Choice

In his study, Geraldo uses the following measure:
When it comes to higher education, I feel:
Positive 1 2 3 4 5 6 7 Negative
Favorable 1 2 3 4 5 6 7 Unfavorable
The answers for each of these two items are added together to create a single score Geraldo calls "attitude towards higher education." What type of measure is Geraldo using in his study?

A) Likert
B) vocational test
C) semantic differential
D) staple