What's the meaning of intently?

[Jinga]

Business Idiom in English, Intermediate level

ESL/EFL Test #89 "Adverbially Speaking", question 1

They had to drive ......... up the hill because the car was very old.

(a) easily
(b) intently
(c) slowly
(d) fairly

Business Idiom in English, Intermediate level

ESL/EFL Test #89 "Adverbially Speaking", answer 1

They had to drive slowly up the hill because the car was very old.

Correct answer: (c) slowly
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what`s the meaning of intently?

Jinga

[Kitosdad]

With great concentration.
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Keep it simple ... Keep it interesting.