Which of the following is a conjunctive adverb? select all that apply. but however therefore meanwhile

The right answers are  "but", "however", "therefore"," meanwhile". Which means all alternatives are correct.

The explanation for this answer is that  conjunctive adverbs are parts of speech that are used to connect one clause to another. They are also used to show sequence, contrast, cause and effect. In this way, we can see that all the alternatives of the question fit into this concept.

the red coloration of the lungs looks alarming and adds to the overall message that the flu is threatening apex