Sentence Correction

Although limited in their usefulness thus far, the company board's several entrepreneurs believe that what the two programmers have developed is the start of something very important.

A-Although limited in their usefulness thus far, the company board's several entrepreneurs
B-Based on the limited usefulness thus far, several of the entrepreneurs on the company board
C-With the limited usefulness thus far, several of the entrepreneurs on the company board
D-Despite the limited usefulness thus far, the several entrepreneurs on the company board
E-While limited in usefulness thus far, the several entrepreneurs on the company board
I cant find what is wrong with A.OA-D
I came down to [spoiler]A&D[/spoiler] later choose the wrong one.
pl help.

Sandipgumtya,

A is wrong because latter part of the sentence uses "is" and the underlined portion "their"
Mismatch in number.

The program was limited in its usefulness... hence usage of their is wrong in option A.