It's common for businesses to work out several scenarios and estimate their outcomes. Then you look at the investment outcomes of those scenarios.
So quite plausibly there might have been these scenarios:
1. Invest More + High Growth
2. Invest More + Low Growth
3. Maintain Investment + High Growth
4. Maintain Investment + Low Growth
5. Divest
You pretty much always want to canvass the option to quit a business. You need it to keep your other estimates honest. Anything else is not only giving into sunk cost fallacy, it's flat out denying its existence.
So rejecting "Divest" doesn't mean it was ever a serious contender. It may be there mostly in the interests of completeness.