Find out the meaning of the phrase underlined in the following sentence:
"Will you call on him today and tell him that he is to reach the office by 7 a.m. tomorrow?"

The correct answer is Option C (To pay a visit to).

Key Points:
• Understanding the Phrasal Verb: The phrasal verb 'call on' (or 'call upon') means to formally visit someone or to pay a short visit to a person at their home or workplace.
• Detailed Option Analysis:
• Option 1 (To shout): 'Call out' means to shout or cry out loudly, which does not fit the context of visiting someone to deliver an official message.
• Option 2 (To remember): 'Call up' or 'call to mind' means to recollect or remember past events or memories.
• Option 3 (To pay a visit to): Correct. In the context of the sentence, visiting the person to inform them about office timings directly corresponds to 'paying a visit to'.
• Option 4 (To invite): 'Call in' or 'invite' involves asking someone to come to a place, whereas 'call on' means going to see them.
• MPSC Exam Trap: Candidates often confuse 'call on' (to visit a person) with 'call at' (to visit a place or location). Always check whether the object is a person or a place.
• Key Takeaway: Remember: 'Call on' means to pay a visit to a person, whereas 'Call at' means to visit a place.