In which of the following sentences are both the capitalization and punctuation correct?
A. Mr. Chan is one of several science teachers in our school; Mrs. Romero is the only Latin teacher.
B. Mr. Chan, having taught for more than twenty years may retire next year?
C. Juana enjoys science, she especially likes Chemistry and its various labs with their interesting results.
D. Mrs. Romero, often encourages her students to recite latin verses aloud.