Dense irregular connective tissue without a synovial cavity would be found connecting the bones involved in which type of joint?
a. fibrous
b. cartilaginous
c. synovial
d. diarthrosis

Fibrous  is the type of joint involved.

Explanation:

Diarthrosis is present at articulating bones which is responsible for the movement. Surrounding synovial capsules identifies it. synovial capsules which secretes synovial fluids to nourish and lubricate the joints while it acts as a shock absorber, surrounds the bones of synovial joints.

Smooth, hyaline cartilages which is of glass like, reduces the friction while movement and are present at the lower of the joint bones. this synovial cavity and regular, dense connective tissue which is responsible for the formation of articular capsules related with accessory ligaments.