This is a participle. It cannot be a gerund, because gerunds have a nominal or adjectival meaning (for example, Swimming is fun - swimming would be a gerund). The -ing form itself is not a 'verb phrase', but 'sneezing uncontrollably' is. So if we are looking only at 'sneezing', the answer is 'participle'.
Answer: The Answer is D
(I get why you were stuck on either B or D)
Answer:
I feel like I am a dead person but can't move
Answer:
1. The boys were playing baseball. 2. The problem that Emilio is facing is that a rottweiler is guarding the baseball that went over the fence. 3. It is Emilio's problem because he hit it over the fence probably.
Explanation: