The subject and verb don't agree, the revised sentence should be
"Sequoia and Charles plan to exercise together."
The correct answer is B. Incidentally.
Explanation
Linking Words are words that are used to relate ideas within a paragraph. To select the appropriate linking word it is necessary to know the context of the sentence to give cohesion and coherence to the text. In the sentence presented, the appropriate linking word is "incidentally" because the idea "wearing certain colors may also attract mosquitoes" acts as a complementary information and the linking word "incidentally" can be used to add ideas. So, the correct answer is B.
The correct answer that would best complete the given statement above would be option C. A school of writing popular at the time Cather wrote My Antonia was REALISM, which focused on the customs, characters, dialect and other traits particular to a specific region. Realism focuses on <span>things that can be observed as well as things that exist independently. Hope this helps.</span>
You’re answer would be C.