Fill in the blank with a suitable preposition.
"What have you learned _______ today's class?" asked the teacher.
The preposition ‘from’ is used to denote a point of origin where something begins. The lesson started or originated from the class, therefore ‘from’ is the apt answer. Hence option A is correct. Whereas ‘since’ is used to denote a reason or the beginning of a time period. The class is not the beginning of a time period hence option B is incorrect. Similarly ‘to’ is used to denote an ending point or the receiving end and both of these are irrelevant here. Hence option D is incorrect. The preposition ‘towards’ is inappropriate here since it is used to denote the direction in which something moves. Hence options C is incorrect.