What is the difference between 'talk' and 'talk to'?

[Jorien]

Test No. incompl/elem-18 "Making an Appointment", question 6

You arrange an appointment with another person because you want to ......... or see them.

(a) encounter
(b) greet
(c) meet
(d) talk

Test No. incompl/elem-18 "Making an Appointment", answer 6

You arrange an appointment with another person because you want to meet or see them.

Correct answer: (c) meet
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what is wrong when you use 'talk' in this sentence?

[Torsten]

Talk requires a preposition: You can talk to or with a person.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary