Under what specific situation is the assumptive close especially effective?

Question $40$ options:

A$)$

when the summary$-$of$-$benefits has been provided

B$)$

when only two choices have been provided

C$)$

when the prospect$/$customer trusts the salesperson

D$)$

when the purchase decision is complex

E$)$

when the product is relatively new in the market with little track history