Only one of the words fits. Check the meanings of the words here, and also look at the example sentences.
Interested in Language
Can I use all of them in this sentence? Do they all have kind of same meaning??
Q: The meeting is an excellent ___ of bringing commodities buyer together.
a) approach b) means c) instrument d) technique
...and change buyer to buyers.
Thanks for the links you provided! They are very useful and I've got the answer.
Q: The meeting is an excellent ___ of bringing commodities buyers together.