The investment function to shift except business expectation.
Option B is correct.
Investment function is the behaviour of investment irrespective to different levels of income/employment. In some other words, it's desire or willingness of producers to invests corresponding to different levels of income.
The level of investment function is based on three factors:
(i) the investment demand of firms,
(ii) the funds available for market, and
(iii) the volume of investment goods produced.
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