James hutton’s and charles lyell’s work suggests that
a. earth is several million years old.
b. earth is several thousand years old.
c. all fossils were formed in the last 1000 years.
d. all rocks on earth contain fossils.

Option A,

Explanation:

James Hutton's simple logic behind claiming that the age of earth was some million year was his observations regarding the tremendous displacements and changes that took place on earth and also which were still happening at his time must have been occurring since million years of time. Such catastrophic changes cannot happen in a short span of time.

He through uniformitarianism  explained the essential features of the Earth's crust that were shaped by  natural processes taking place over geologic time. He also formulated the vision for evolution of living beings. Like wise Lyell's version of geology was also based on uniformitarianism.

Hence, option A is correct