Part B is probably a dual Philips BC847 NPN transistor. The center pins are the bases. The next pin clockwise from a base is the emitter, and the pin on the opposite side to the emitter is the collector.
Part C is probably a dual diode - Possible either a dual BAS40-04 or a dual BAT54SW schottky diode.
Part D looks like a 1.4K resistor. Don't know what the blue color means. Unless someone can recognise the manufacturer, it will probably be hard to work out things like tolerance.
Part A? A Texas instruments TL085 opamp JFET opamp is my best guess. Looks right.
Richard