In the highlighted phrase, the phrasal verb 'get on' which means 'perform or make progress in a specific way' is contextually irrelevant to the given sentence, which talks about the inability of latecomers to do some action with respect to school. Among the given options, 'get into' means 'take control of some person', 'get up' means 'rise from bed after sleeping' and 'get together' means 'to gather or assemble socially'; all these are contextually unfit for the given sentence, so they are negated. Option (a) 'get in' means 'to arrive at/enter a destination' matches the context of the sentence and can replace the incorrect phrase in the given sentence.
Hence, the correct answer is option (a).
Note:
Phrasal verb: A phrase that consists of a verb with a preposition or adverb or both, the meaning of which is different from the meaning of its separate parts. Example: She has always looked down on me. Here, the phrasal verb 'to look down on someone' doesn't mean that you are looking down from a higher place at someone who is below you; it means that you think that you are better than someone.
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