Identify the correct sentence.
A. Akani had wanted to volunteer, however; she was offended when the charity insisted they were only interested in monetary donations.
B. Akani had wanted to volunteer, however, she was offended when the charity insisted they were only interested in monetary donations.
C. Akani had wanted to volunteer: however, she was offended when the charity insisted they were only interested in monetary donations.
D. Akani had wanted to volunteer; however, she was offended when the charity insisted they were only interested in monetary donations.

In using the conjunction "however" in any sentence, it is first important to see how or why it has to be used. In cases of two contrasting sentences, 'however' can be used right after the first sentence but as a start for the new sentence.

eg, I would love to go with you to the movies. However, I have already made plans with my family so I can't.

In another case, 'however' can be used to present two contrasting sentences that are closely connected. This way, the presentation of the contradicted and contrasting sentences will be made more simple. So, in this case, a semicolon will be used just before 'however' and then followed by a comma.

eg, I wanted to eat cake: however, it is bad for my health.

So, the correct sentence among the options given in the question is option D.