What Did Galileo See When He Observed Venus Through His

What did Galileo see when he observed Venus through his telescope?

A) Venus has an angular size, which increases and decreases markedly but does not show phases (e.g., crescent) .
B) Venus has phases like the Moon and, also like the Moon, is almost constant in angular size.
C) Venus has phases like the Moon, and its largest angular diameter is at gibbous phase.
D) Venus has phases like the Moon, and its largest angular diameter is at crescent phase.