Step 1: Sort seismic sources into two families.
Seismic sources split broadly into two groups: ones that work by direct contact with the ground, used on land, and ones that work by making a pressure pulse in water, used at sea.
Step 2: List the land group.
The vibrator truck, often called Vibroseis (given here as "Vibrosis"), shakes the ground with a long sweep signal. Dynamite is set off in a shot hole drilled into the ground. The thumper drops a heavy weight onto a plate resting on the surface. All three need solid ground to push against, so all three are land sources.
Step 3: List the marine group.
The airgun fires a blast of compressed air underwater. The surrounding water carries the pressure pulse down to the seabed. Without water around it, an airgun cannot make a usable seismic pulse, so it is not used for work on land.
Step 4: Match to the options.
Since the question asks only for land sources, we keep the vibrator, dynamite and thumper, and drop the airgun.
\[ \boxed{\text{(A), (B) and (D)}} \]