Set 25 # 5

[touche]

C
x^3y^4=5,000 indicates x >0 and y<>0.
1. y is a positive integer. Indicates y could be any integer <49, while x could be any real number. insufficient .
2.x is an integer. insuff as y could be any real number.
1 & 2. limit possibilities to x=2 and y=5 , suff

[nb.750]

Yes, C is the answer