Solve the Problem $N(r)=-5000 \ln r$ , Where $r$ Is the Percent of Words from the Ancestral Language Common

Multiple Choice

Solve the problem.
-The number of years since two independently evolving languages split off from a common ancestral language is approximated by $N(r) =-5000 \ln r$ , where $r$ is the percent of words from the ancestral language common to both languages now. Find $r$ if two languages split about 1530 years ago. Round to the nearest percent.

A) $74 \%$
B) $153 \%$
C) $7 \%$
D) $15 \%$