Shaheensingh17
in the first why d is correct and not a and i the second question why e is correct and not b and c
First: Option a is wrong because the part "some of
them write the scripts for, act in, and even produce own motion pictures" is an indepedent clause separated only by a comma without any conjunction. An indepedent clause cannot act as a subgroup modifier. In option d, "some of
whom write the scripts for, act in, and even produce " is a dependent clause, and can act as a subgroup modifier.
Second: The relative pronouns "that" and "which" must have a noun to refer to. Pronouns cannot refer to an entire clause. In b and c, "that" and "which" refers to the entire clause "She is the best speaker". Moreover option d is correct in this case, not e as you mentioned. The problem with e is the wrong use of "this" - "this" is a demonstrative adjective and hence must have a noun to refer to.