Oil formed because:
a. leaves, twigs, and tree trunks decomposed under conditions of heat, pressure, and low oxygen.
b. tiny algae and plankton decomposed under conditions of heat, pressure, and low oxygen.
c. the decomposition of organic material remained aerobic (lots of oxygen) for a long time.
d. large sauropod-type dinosaurs decayed in swamps.
e. the temperature reached a minimum of 1,000°c.

B. Tiny algae and plankton decomposed under conditions of heat, pressure, and low oxygen.

Explanation:

oil is formed because of fossils fuel which are  formed  from decomposition of large amount of small animals and plants and increase pressure and temperature.

straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.