Solve the Problem $\mathrm { I } ( \mathrm { t } ) = - 0.1 \mathrm { t } ^ { 2 } + 1.9 \mathrm { t }$

Multiple Choice

Solve the problem.
-The polynomial function $\mathrm { I } ( \mathrm { t } ) = - 0.1 \mathrm { t } ^ { 2 } + 1.9 \mathrm { t }$ represents the yearly income (or loss) from a real estate investment, where $t$ is time in years. After how many years does income begin to decline? Round to the nearest tenth of a year, if necessary.

A) $9.5$ years
B) $12.7$ years
C) 19 years
D) $8.5$ years