Engaging members via mobile with digital fitness challenges, reward programs, push notifications and wearable integration not only (allows/allow) fitness operators to foster existing relationships with clients but also build on them.

• Correct answer is "allow"
  The sentence would be--Engaging members via mobile with digital fitness challenges, reward programs, push notifications and wearable integration not only "allow" fitness operators (plural) to foster existing relationships(plural) with clients but also build on them.
• 6 years agoHelpfull: Yes(12) No(0)
• Answer:- allows
• 6 years agoHelpfull: Yes(2) No(8)
• allow due to plural
• 5 years agoHelpfull: Yes(1) No(0)
• I think allow because(operators)
• 5 years agoHelpfull: Yes(0) No(0)