Now I have enough information to give a thorough, well-sourced answer.

The question asks which of these sequences have an average repeat frequency in the human (Homo sapiens) genome. The checked answers in the image are:

Here is a breakdown of each option:

LINEs are moderately repetitive sequences, present in approximately 850,000 copies per genome, accounting for nearly 20% of the human genome. They are 6-7 kb in length and are dispersed throughout the genome, not clustered. They are retroposons (move via RNA intermediate/reverse transcriptase). - Thompson & Thompson Genetics and Genomics, 9th ed., p. 280

SINEs (e.g., Alu family) are highly repetitive - over 1 million copies in the human genome (~10% of human DNA). While they do have an "average" repeat in the sense they are moderate, they are generally classified as highly repetitive and would be more than average in frequency compared to LINEs. The question's framing likely excludes them in favor of elements with more "moderate" frequencies, though this depends on the exact classification used.

SMN1 and SMN2 exist in only 1-2 copies per haploid genome. These are essentially single-copy or low-copy genes, not repetitive sequences with average repeat frequency.

LTR retrotransposons make up about 8.3% of the human genome. While present in many copies, they are usually categorized separately from the classic moderately repetitive sequences.

tRNA genes exist in hundreds of copies (~500-600 in humans), scattered across all chromosomes. They are a classic example of moderately repetitive sequences - present in enough copies to be "repetitive" but not in the millions. - Basic Medical Biochemistry, 6th ed.

Ribosomal RNA (rRNA) genes are tandemly repeated on the short arms of the 5 acrocentric chromosomes (chromosomes 13, 14, 15, 21, 22) in humans. There are approximately 300-400 copies of the 18S-5.8S-28S rRNA gene cluster per haploid genome, making them a textbook example of moderately repetitive sequences.

The correct answers (as shown in the image with checkmarks) are: LINE elements, Genes encoding tRNA, and rRNA coding genes - all classic examples of moderately repetitive sequences in the human genome.

Sources: Thompson & Thompson Genetics and Genomics in Medicine, 9th ed. | [Harper's Illustrated Biochemistry, 32nd ed.] | PMC: Repetitive DNA sequence detection