Mashaal Masha
Bengali author Toru Dutt's _A Sheaf Gleaned in French Fields_ (1876), a volume of English translations of French poems, ________ scholars' understanding of the transnational and multilingual contexts in which Dutt lived and worked.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Hard
A: 

has enhanced

B: 

are enhancing

C: 

have enhanced

D: 

enhance