Mull (something) over

Do you know the English expression “to mull (something) over”? Read the conversation below. Can you guess the meaning?

Akira: So have you decided which university you are going to apply to?

Taichi: No, I’m still mulling it over. I have to make a decision soon though.

Does it mean:

a) seriously consider something

b) be confused by something

c) make a decision later

d) be frustrated

The answer is below!↓

auditorium benches chairs class

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Answer: a) seriously consider something