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In a community service class in the fall, $3$ of the $15$ class sessions were lectures, while all others were devoted to fieldwork in parks. In the spring, the number of sessions devoted to fieldwork remained the same, but the total number of sessions increased to $18$ . In the spring, what percent of class sessions were lectures?$\newline$Choose $1$ answer:$\newline$(A) $16.7 \%$$\newline$(B) $33.3 \%$$\newline$(C) $66.7 \%$$\newline$(D) $83.3 \%$