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Lanthanoids are

$\begin{array}{1 1}(a)\;\text{14 elements in the sixth period (atomic no = 58 to 71) that are filling 4f sublevel}\\(b)\;\text{14 elements in the sixth period (atomic no = 90 to 103) that are filling 4f sublevel}\\(c)\;\text{14 elements in the seventh period (atomic no = 58 to 71) that are filling 4f sublevel}\\(d)\;\text{14 elements in the seventh period (atomic no = 90 to 103) that are filling 4f sublevel}\end{array}$

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A)
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14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sublevel
As sixth period can accommodate only 18 element in the table, 14 member of HF series (atomic number 58 ot 71) are separately accommodated in a horizontal row below the periodic table. These are called as lanthanides.
Hence (a) is the correct answer.
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