The correct option is C decided
The correct answer is Option C.
The given passage is in the past tense. Thus the verb will also be in the past tense - DECIDED is the past tense.
The remaining options are incorrect because:
Option A: DECIDE is the present tense.
Option B: DECIDES also is the present tense.
Option D: DECISION is a noun.
Hence Option C is the correct answer.
\