(A)
includes several groundbreaking modifications through which parent and child explore stunning 3-D landscapes and solve challenging emotional and interpersonal scenarios......................................S-V issue. Plural verb is needed.
(B)
include several groundbreaking modifications enabling both parent and child to explore stunning 3-D landscapes and to solve challenging emotional and interpersonal scenarios..............................Looks fine
(C) include several groundbreaking modifications through which parent and child explore stunning 3-D landscapes and
solves challenging emotional and interpersonal scenarios...............S-V issue.
(D)
is a tool with which parent and child explore stunning 3-D landscapes and solve challenging emotional and interpersonal scenarios, using the groundbreaking modifications included............................S-V issue
(E)
are groundbreaking modifications through which parent and child explore stunning 3-D landscapes and solve challenging emotional and interpersonal scenarios........................................Meaning change
IMO OA should be B