b. False. The material, however, must be attributed appropriately.
When paraphrasing, we are using our words to convey the main message. Therefore, it is not necessary to use quotation marks but it must be properly cited and attributed. But generally, if you are taking an exact sentence from the original source, it is considered as a quote and quotation marks should be used.
Therefore, in summary, paraphrased sentences from any source do not require quotation marks but should be properly attributed while quotes from original sources must use quotation marks.
Crivelli was born in Venice and probably trained with Squarcione in Padua. He spent most of his life in the Marches (eastern central Italy), after periods in Venice and Zara. Crivelli was active as a painter by 1457 when he was condemned in Venice for adultery. He was very successful as a maker of altarpieces in the Marches. These are especially well represented in the Collection.
Crivelli was influenced by the Vivarini at an early stage. From Squarcione, or one of his pupils such as Giorgio Schiavone, Crivelli could learn simulated marble architecture; festoons of fruit; parchment cartellini and music-making putti. Venetian painting up to this point had been dominated by the Late Gothic style, such as that of Jacopo Bellini and his son Gentile.
Crivelli was a fine technical painter and his pictures are in a good state of preservation. He had a strong linear decorative sense and was a brilliant colourist. His work was particularly appreciated in the 19th century, as witnessed by the price paid for the Gallery's 'Madonna della Rondine'.