Fill in the blank with a suitable preposition.
Lisa felt dizzy after the running race, so she stood with her back ________ the tree for support.
In the given context Lisa is dizzy and therefore she is using the tree as a support by leaning on it. Therefore ‘against’ is the suitable answer, since ‘against’ means to be in touch with a surface so as to be supported by the object. Hence option C is correct. ‘Above’ means higher than something. Lisa is not standing on top of the tree, therefore, option A is incorrect. Whereas ‘at’ is used to denote an exact place/spot. The tree here is not a place but an object that supports her, therefore, option B is incorrect. Similarly ‘among’ is used when we refer to something being amidst a group of elements or things. There is only one tree here which is expressed through the phrase ‘the tree’ thus option D is incorrect.