The correct option is
A Bast resin (latex)
Hevea brasiliensis, the para rubber tree most commonly, the rubber tree, is a tree belonging to the family
Euphorbiaceae. It is the most economically important member of the genus
Hevea. It is of major economic importance, because the milky latex extracted from the tree is the primary source of natural rubber. So,
Hevea yields bast resin, which is latex.
Thus, the correct answer is option A.