Correct option is D
The statement about the Vallabha Sampradaya that is NOT correct is: Vallabha established a centre at Gokul where he gathered a group of singers and poets known as Asht-chhap
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Radha was made predominant in Vallabha system by Vitthalnath: This is correct. While Vallabha's philosophy (Pushtimarg) focused on bhakti to Krishna, the explicit emphasis on Radha as the Swamini (mistress) and her central role in the rasa lila theology was significantly developed and formalized by his son, Vitthalnath, and the Asht-chhap poets.
Vallabha established a centre at Gokul where he gathered a group of singers and poets known as Asht-chhap: This statement is incorrect. Vallabhacharya did establish a significant centre at Gokul. However, the famous group of eight poets and singers known as the Asht-chhap was organized and brought together by his son, Vitthalnath.
Vallabha established Srinath temple at Govardhan Hill: This is correct. According to tradition, Vallabhacharya found the self-manifested deity of Srinathji on Govardhan Hill and arranged for a small shrine to be built.
Vallabha almost ignored Radha: This statement can be considered relatively correct. Vallabha's personal worship and philosophical focus were predominantly on the male deity Krishna (Srinathji) as Purna Purushottama (the Supreme Being). The devotional emphasis on Radha developed more fully under his son, Vitthalnath, who introduced the worship of Radha alongside Krishna.
The most factually incorrect statement is because the Asht-chhap group was formed by Vitthalnath, not Vallabha.