To have a finger in every pie

[ositadimma]

Test No. express/advan-2 "Hands on", question 5

In the obituary about the millionaire all his enterprises were listed and it looked as if he had had a finger in every pie.

(a) a control over many activities
(b) an involvement in many activities
(c) an interference in many activities
(d) a belief in many activities

Test No. express/advan-2 "Hands on", answer 5

In the obituary about the millionaire all his enterprises were listed and it looked as if he had had an involvement in many activities.

Correct answer: (b) an involvement in many activities
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please a need more explanations and the correct answer to this question

[Torsten]

To have a finger in every pie is an idiom and it means that you are pursuing various activities at the same time.
Please, read this explanation too:
http://www.english-test.net/faq/2/index.html

TOEFL listening lectures: A lecture from a social sciences class (3)