Atransform fault is a. a dip-slip fault connecting an anticline with a syncline b. a strike-slip fault that forms the boundary between tectonic plates c. the rift bounding fault on a mid-ocean ridge d. a reverse fault that steepens into a thrust fault

b. a strike-slip fault that forms the boundary between tectonic plates

Explanation:

Firstly, a strike-slip fault is simply an horizontal motion parallel to the strike of the faults surface.

A transform faults usually exist between tectonic plates boundaries and usually their is a strike-slip movement along the faults. The most notable transform faults is the San Andrea  faults in California.

Generally, transforms faults comes from the fact that the displacement along the faults abruptly ends or transform into another kind of displacement.