Write the Sum Using Summation Notation, Assuming the Suggested Pattern $$9 + 11 + 13 + 15 + \ldots + ( 2 n + 1 ) \ldots$$

Multiple Choice

Write the sum using summation notation, assuming the suggested pattern continues.
- $$9 + 11 + 13 + 15 + \ldots + ( 2 n + 1 ) \ldots$$

A) $\sum _ { n = 5 } ^ { 20 } ( 2 n + 1 )$
B) $\sum _ { n = 4 } ^ { 20 } ( 2 n + 1 )$
C) $\sum _ { n = 5 } ^ { \infty } ( 2 n + 1 )$
D) $\sum _ { n = 4 } ^ { \infty } ( 2 n + 1 )$