The narrowest canal found in a three root maxillary first molar is the.. Mesio-buccal canal

The narrowest canal found in a three root maxillary first molar is the:

a. Mesio-buccal canal. ***

b. Disto-buccal canal.

c. Palatal canal.

d. Disto-palatal canal.

e. Mesio-palatal canal.