Read the passage given below and answer the questions that follow:
All through the night, Lencho thought only of his one hope: the help of God, whose eyes, as he had been instructed, see everything, even what is deep in one's conscience, Lencho was an ox of a man, working like an animal in the fields, but still he knew how to write. The following Sunday, at daybreak, he began to write a letter which he himself would carry to town and place in the mail. It was nothing less than a letter to God.
Lencho was an ox of a man means :

Options

A. He was very hard-working
B. He owned an ox
C. He ploughed his field with an ox
D. His ox could work like a man