Which sum is equal to ?
Fraction tile block labeled one whole. Below the whole are 4 blocks each labeled one-fourth. The four blocks together equal the whole.

A.1/1+1/1+1/1+1/1


B.1/4+1/4+1/4+14


C.4/4+4/4+4/4+4/4


D.4/1+4/1+4/1+4/1