Find the Sum of the First N Terms of the Following

Multiple Choice

Find the sum of the first n terms of the following arithmetic sequence.
- $$\mathrm { a } _ { 1 } = - 12 , \mathrm {~d} = - 1 ; \mathrm { n } = 5$$

A) $- 60$
B) $- 17$
C) $- 70$
D) 7