The correct option is B Exogenous in origin
Lateral branches of stem are exogenous in origin. The branching structure of trees varies among species, which gives them distinctive shapes. All trees posses a basic structure of spreading root system, trunk and scaffold branches. Scaffold branches are the main, muscular arms that grow off of the trunk. A lateral branch is any secondary branch that grows off of the main trunk or scaffolds.
Thus, the correct answer is option B.