Incrementally means learning in a way involving something being done in a series of amounts. In this information learned on day one is the base for information on day two.
Incrementally means learning according to section by section.
Any learning takes a particular time, which may be days or months. As for making any institution the base should be strong, just like that learning incrementally provides strong foundation to the learners.
Learning incrementally promotes that information learned on day one is the base for information on day two.
Thus, the correct option is a.
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