In which pair of students do we see a distinct difference in learning style...

In which pair of students do we see a distinct difference in learning style (Tier 1 differentiation)?

a. Abby does her assigned readings only if she knows she will be tested on them. In contrast, Adam reads every assignment because he finds the subject matter fascinating.
b. Bill tries hard to do his best at everything. In contrast, Beth only works at tasks that come easily to her.
c. Cara enjoys every minute that she is at school and approaches each new classroom activity with enthusiasm. In contrast, Connor sits at the back of the classroom uninvolved and mumbling under his breath that every activity is "stupid."
d. When taking a test, David thinks his answers through carefully before responding. In contrast, Donna quickly jots down the first thing that comes to mind.