There is a great deal of research ___that music activities engage different parts of the brain.

A. indicate             B. indicating          C. to indicate         D. to be indicating

       There is a great deal of research _______ that music activities engage different parts of the brain.

A. indicate             B. indicating          C. to indicate         D. to be indicating

There is a great deal of research ___that music activities engage different parts of the brain.