The correct option is C English
By the given information, day of work, friends name and language are arrange in following table
DayMonTuesWedThurFriSatSunFriend′s NameQNRPMSOLanguageEnglishSanskritFrenchChineseSpanishJapaneseGerman
From the above table, we get the answer of all questions.
Q is learning English language on Monday